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Wannier-Stark resonances in semiconductor superlattices / M. . Gluck [et al.] // Phys. Rev. B. - 2002. - Vol. 65, Is. 11. - Ст. 115302, DOI 10.1103/PhysRevB.65.115302. - Cited References: 22 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
ELECTRIC-FIELD
   STATES
   LADDERS
   BREAKDOWN
   BLOCH
   LOCALIZATION
Аннотация: Wannier-Stark states for semiconductor superlattices in strong static fields, where the interband Landau-Zener tunneling cannot be neglected, are rigorously calculated. The lifetime of these metastable states was found to show multiscale oscillations as a function of the static field, which is explained by an interaction with above-barrier resonances. An equation, expressing the absorption spectrum of semiconductor superlattices in terms of the resonance Wannier-Stark states, is obtained and used to calculate the absorption spectrum in the region of high static fields.

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Держатели документа:
Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Gluck, M.; Kolovsky, A. R.; Коловский, Андрей Радиевич; Korsch, H. J.; Zimmer, F.
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Strength of topologically induced magnetic moments in a quantum device / P. . Exner [et al.] // Phys. Rev. Lett. - 1998. - Vol. 80, Is. 8. - P. 1710-1713, DOI 10.1103/PhysRevLett.80.1710. - Cited References: 13 . - ISSN 0031-9007

РУБ Physics, Multidisciplinary
Рубрики:
WAVE-GUIDES
STATES
FLOW
Аннотация: We consider resonant vortices around nodal points of the wave function describing electron transport through a mesoscopic der-ice. With a suitable choice of the device geometry. the dominating role is played of single vortices with a preferred orientation. To characterize the strength of the resulting magnetic moment, we have introduced a "magnetance," the quantity defined in analogy with the device conductance. Its basic properties and possible experimental detection are discussed. [S0031-9007(97)05255-1].

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Держатели документа:
Acad Sci Czech Republ, Inst Nucl Phys, CZ-25068 Rez, Czech Republic
Czech Tech Univ, Doppler Inst, Prague 11519, Czech Republic
Acad Sci Czech Republ, Inst Phys, CR-16200 Prague, Czech Republic
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Exner, P.; Seba, P.; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Streda, P.; Feher, P.
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Specific features of the electronic structure and optical spectra of nanoparticles with strong electron correlations / S. G. Ovchinnikov [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 6. - P. 1116-1120, DOI 10.1134/S1063783407060169. - Cited References: 18. - This study was supported by the Russian Academy of Sciences within the program "Strong Electron Correlations", the Integration Project of the Siberian Division–Ural Division of the Russian Academy of Sciences (project no. 74), the Federal Agency for Science and Innovation (contract no. 02.434.11.7048), the Russian Foundation for Basic Research (project no. 06-03-32943), and the Branch of General Physics and Astronomy of the Russian Academy of Sciences and the Presidium of the Ural Division of the Russian Academy of Sciences within the program "New Materials and Structures" . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CUO
ABSORPTION
STATES
Аннотация: Analysis of the experimental optical spectra of CuO nanoparticles with the electronic structure characterized by strong electron correlations has revealed the appearance of unusual states inside the band gap. The intragap states an the specific features of the electronic structure of CuO nanoparticles are discussed in the framework of the generalized tight-binding method previously developed for describing the electronic structure of superconducting cuprates.

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Публикация на русском языке Особенности электронной структуры и оптических спектров наночастиц с сильными электронными корреляциями [Текст] / С. Г. Овчинников [и др.] // Физ. тверд. тела. - 2007. - Т. 49 Вып. 6. - С. 1061-1065

Держатели документа:
LV Kirenskii Inst Phys, Russian Acad Sci, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Met Phys, Ural Div, Ekaterinburg 620041, Russia
Russian Fed Nucl Ctr, Zababakhin All Russia Res Inst Tech Phys, Chelyabinsk 456770, Russia
Russian Acad Sci, Inst Electrophys, Ural Div, Ekaterinburg 620016, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg 620041, Russian Federation
Russian Federal Nuclear Center, Zababakhin All-Russia Research Institute of Technical Physics, Snezhinsk, Chelyabinsk Oblast 456770, Russian Federation
Institute of Electrophysics, Ural Division, Russian Academy of Sciences, ul. Amundsena 106, Yekaterinburg 620016, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Gizhevskii, B. A.; Sukhorukov, Y. P.; Ermakov, A. E.; Uimin, M. A.; Kozlov, E. A.; Kotov, Y. A.; Bagazeev, A. V.
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Sadreev, A. F.
Trapping of an electron in the transmission through two quantum dots coupled by a wire / A. F. Sadreev, E. N. Bulgakov, I. . Rotter // JETP Letters. - 2005. - Vol. 82, Is. 8. - P. 498-503, DOI 10.1134/1.2150869. - Cited References: 32 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
NUCLEAR REACTIONS
   CIRCULAR BENDS
   UNIFIED THEORY
   WAVE-GUIDES
   S-MATRIX
   STATES
   BILLIARD
   SYSTEMS
Аннотация: We consider single-channel transmission through a double quantum dot that consists of two identical single dots coupled by a wire. The numerical solution for the scattering wave function shows that the resonance width of a few of the states may vanish when the width (or length) of the wire and the energy of the incident particle each take a certain value. In such a case, a particle is trapped inside the wire as the numerical visualization of the scattering wave function shows. To understand these numerical results, we explore a simple model with a small number of states, which allows us to consider the problem analytically. If the eigenenergies of the closed system cross the energies of the transmission zeroes, the wire effectively decouples from the rest of the system and traps the particle. (C) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
ИФ СО РАН
Institute of Physics, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Department of Physics and Measurement Technology, Linkoping University, S-58183 Linkoping, Sweden
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany

Доп.точки доступа:
Bulgakov, E. N.; Булгаков, Евгений Николаевич; Rotter, I.; Садреев, Алмаз Фаттахович
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Sadreev, A. F.
S-matrix formalism of transmission through two quantum billiards coupled by a waveguide / A. F. Sadreev, E. N. Bulgakov, I. . Rotter // J. Phys. A. - 2005. - Vol. 38, Is. 49. - P. 10647-10661, DOI 10.1088/0305-4470/38/49/012. - Cited References: 32 . - ISSN 0305-4470

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
CIRCULAR BENDS
   DOTS
   TRANSPORT
   CONTINUUM
   SYSTEMS
   STATES
Аннотация: We consider a system that consists of two single-quantum billiards (QBs) coupled by a waveguide and study the transmission through this system as a function of length and width of the waveguide. To interpret the numerical results for the transmission, we explore a simple model with a small number of states which allows us to consider the problem analytically. The transmission is described in the S-matrix formalism by using the non-Hermitian effective Hamilton operator for the open system. The coupling of the single QBs to the internal waveguide characterizes the 'internal' coupling strength u of the states of the system while that of the system as a whole to the attached leads determines the 'external' coupling strength v of the resonance states via the continuum (waves in the leads). The transmission is resonant for all values of v/u in relation to the effective Hamiltonian. It depends strongly on the ratio u/u via the eigenvalues and eigenfunctions of the effective Hamiltonian. The results obtained are compared qualitatively with those from simulation calculations for larger systems. Most interesting is the existence of resonance states with vanishing widths that may appear at all values of v/u. They cause zeros in the transmission through the double QB due to trapping of the particle in the waveguide.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
ИФ СО РАН
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Department of Physics and Measurement Technology, Linkoping University, S-581 83 Linkoping, Sweden
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany

Доп.точки доступа:
Bulgakov, E. N.; Булгаков, Евгений Николаевич; Rotter, I.; Садреев, Алмаз Фаттахович
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Sadreev, A. F.
Feshbach projection formalism for transmission through a time-periodic potential / A. F. Sadreev // Phys. Rev. E. - 2012. - Vol. 86, Is. 5. - Ст. 56211, DOI 10.1103/PhysRevE.86.056211. - Cited References: 33 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
NUCLEAR REACTIONS
   UNIFIED THEORY
   QUANTUM
   FIELD
   SCATTERING
   SYSTEM
   STATES
Аннотация: The Feshbach projection formalism is applied to consider quantum transmission through a tight-binding wire subject to a time-periodic potential. The wire is coupled with two leads via the coupling constant v(C). The periodicity of the potential implies an additional temporal dimension that reduces the problem to stationary transmission through an effectively two-dimensional lattice system. The non-Hermitian effective Hamiltonian is formulated. Thist allows us to trace the redistribution of resonance positions and resonance widths with the growth of v(C) from the weak-coupling to the strong-coupling regime.

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Доп.точки доступа:
Садреев, Алмаз Фаттахович
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Pyatnov, M. V.
Tunable hybrid optical modes in a bounded cholesteric liquid crystal with a twist defect / M. V. Pyatnov, S. Y. Vetrov, I. V. Timofeev // Phys. Rev. E. - 2018. - Vol. 97, Is. 3. - Ст. 032703, DOI 10.1103/PhysRevE.97.032703. - Cited References:47. - The reported study was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund for the research Projects No. 17-42-240464 and No. 18-42-243025. . - ISSN 2470-0045. - ISSN 2470-0053

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
SCULPTURED THIN-FILMS
   STRUCTURE ADJACENT
   TAMM PLASMONS
   STATES
   METAL
Аннотация: Coupling between the defect mode of a cholesteric liquid crystal and the localized mode of a cholesteric liquid crystal-phase plate-metal structure is theoretically demonstrated. It is shown that the transmittance spectrum can be tuned by changing the twist-defect angle and helix pitch, which are governed by external factors. The spectra for different circular polarizations of the incident light are different; specifically, at the nondiffracting polarization, there is no defect-mode transmittance peak.

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Держатели документа:
Siberian Fed Univ, Inst Nanotechnol Spect & Quantum Chem, Krasnoyarsk 660041, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
SB RAS, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [17-42-240464, 18-42-243025]
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Pichugin, K.
Effective coupling for open billiards / K. . Pichugin, H. . Schanz, P. . Seba // Phys. Rev. E. - 2001. - Vol. 64, Is. 5. - Ст. 56227, DOI 10.1103/PhysRevE.64.056227. - Cited References: 30 . - ISSN 1063-651X

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
QUANTUM CHAOTIC SCATTERING
   MICROWAVE CAVITY
   RESONANCE POLES
   QUANTIZATION
   STATISTICS
   DYNAMICS
   FORMULA
   SYSTEMS
   STATES
Аннотация: We derive an explicit expression for the coupling constants of individual eigenstates of a closed billiard that is opened by attaching a waveguide. The Wigner time delay and the resonance positions resulting from the coupling constants are compared to an exact numerical calculation. Deviations can be attributed to evanescent modes in the waveguide and to the finite number of eigenstates taken into account. The influence of the shape of the billiard and of the boundary conditions at the mouth of the waveguide are also discussed. Finally we show that the mean value of the dimensionless coupling constants tends to the critical value when the eigenstates of the billiard follow random-matrix theory.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic
Univ Gottingen, Inst Nichtlineare Dynam, D-37073 Gottingen, Germany
Max Planck Inst Stromungsforsch, D-37073 Gottingen, Germany
Pedag Univ, Dept Phys, Hradec Kralove, Czech Republic
ИФ СО РАН

Доп.точки доступа:
Schanz, H.; Seba, P.
}
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Pankin, P. S.
Tamm plasmon in a structure with the nanocomposite containing spheroidal core-shell particles / P. S. Pankin, S. Y. Vetrov, I. V. Timofeev // J. Opt. - 2019. - Vol. 21, Is. 3. - Ст. 035103, DOI 10.1088/2040-8986/ab04d8. - Cited References: 49. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project No. 17-42-240464. P S P acknowledges the support of the Scholarship of the President of the Russian Federation No. SP-227.2016.5. . - ISSN 2040-8978. - ISSN 2040-8986

РУБ Optics
Рубрики:
DIMENSIONAL PHOTONIC CRYSTAL
   ENHANCEMENT
   EMISSION
   STATES
Кл.слова (ненормированные):
Tamm plasmon -- nanocomposite -- photonic crystal -- core-shell particles
Аннотация: Spectral peculiarities of the structure consisting of a photonic crystal coated with a nanocomposite (NC) have been investigated. The NC used contains spheroidal nanoparticles with a dielectric core and a metallic shell, which are uniformly dispersed in a transparent matrix. The spectral manifestation of the observed Tamm plasmon polariton (TPP) and Fabry-Perot mode has been examined. A significant polarization sensitivity of the spectra upon variation in the nanoparticle shape has been demonstrated. The dispersion curves presented for the TPP and Fabry-Perot mode are shown to be in good agreement with the spectra obtained by the transfer matrix method.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk Sci Ctr,Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Панкин, Павел Сергеевич; Russian Foundation for Basic Research; Government of the Krasnoyarsk Territory; Krasnoyarsk Territorial Foundation [17-42-240464]; Scholarship of the President of the Russian Federation [SP-227.2016.5]
}
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10.

Ovchinnikov, S. G.
General analysis of the angle-resolved photoemission line shape for strongly correlated electron systems / S. G. Ovchinnikov, E. I. Shneyder, A. A. Kordyuk // Phys. Rev. B. - 2014. - Vol. 90, Is. 22. - Ст. 220505(R), DOI 10.1103/PhysRevB.90.220505. - Cited References: 30. - S.G.O. and E.I.S. are thankful to Russian Science Foundation (Project No. 14-12-00061), A.A.K. is thankful to National Academy of Sciences of Ukraine (Project No. 73-02-14) for financial support. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
REPRESENTATION
STATES
Аннотация: In many cases the standard perturbation approach appears to be too simple to describe precisely the angle-resolved photoemission spectrum of a strongly correlated electron system. In particular, to describe the momentum asymmetry observed in the photoemission spectra of high- cuprates, a phenomenological approach based on an extremely correlated Fermi-liquid model has been recently introduced. Here we analyze the general structure of the Green's function of quasiparticles in strongly correlated electron systems and stress that it is defined not only by the self-energy of Hubbard quasiparticles but also by a strength operator. The latter leads to an additional odd momentum contribution to the spectral function and alone can explain the observed asymmetry. So, the asymmetry of the angle-resolved photoemission spectra can be a measure of the strength of electron correlations in materials.

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Держатели документа:
Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Natl Acad Sci Ukraine, Inst Met Phys, UA-03142 Kiev, Ukraine

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Kordyuk, A. A.; Овчинников, Сергей Геннадьевич; Russian Science Foundation [14-12-00061]; National Academy of Sciences of Ukraine [73-02-14]
}
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11.

Model of a tunable hybrid Tamm mode-liquid crystal device / M. V. Pyatnov, R. G. Bikbaev, I. V. Timofeev, S. Y. Vetrov // Appl. Optics. - 2020. - Vol. 59, Is. 21. - P. 6347-6351, DOI 10.1364/AO.395901. - Cited References: 37. - Russian Foundation for Basic Research (19-52-52006) . - ISSN 1559-128X. - ISSN 2155-3165

РУБ Optics
Рубрики:
PLASMON
   PHASE
   SENSOR
   STATES
Аннотация: A concept of an easily tunable device based on hybrid Tamm modes is proposed. The device can be controlled using a high-sensitivity chiral liquid crystal serving as a mirror. The coupling of the chiral optical Tamm state with the Tamm plasmons is predicted. The Tamm plasmons are excited at different frequencies for the orthogonal linear polarizations, while the chiral Tamm state is excited at only one frequency. The properties of the proposed model are analytically and numerically calculated. The possibility of creating a two- and three-mode laser with tunable characteristics on the basis of the proposed model is discussed.

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Держатели документа:
Russian Acad Sci, Fed Res Ctr, Kirensky Inst Phys, Siberian Branch,Krasnoyarsk Sci Ctr, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Pyatnov, M. V.; Пятнов, Максим Владимирович; Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Timofeev, I. V.; Тимофеев, Иван Владимирович; Vetrov, S. Ya.; Ветров, Степан Яковлевич; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-52006]
}
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12.

Malakhovskii, A. V.
Temperature dependence of the fine structure of the C and E absorption bands in RbMnF3 below the Neel temperature / A. V. Malakhovskii, T. P. Morozova // Phys. Solid State. - 2006. - Vol. 48, Is. 2. - P. 283-290, DOI 10.1134/S1063783406020156. - Cited References: 24 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE FLUORIDES
   VIBRONIC SPECTRA
   CRYSTALS
   MNF2
   INTENSITY
   DICHROISM
   STATES
Аннотация: The variation in the parameters (width, position, intensity) of the fine structure lines in the C[(6)A(1g) - (4)A(1g), E-4(g)((4)G)] and E[(6)A(1g) - E-4(g)(D-4)] bands in RbMnF3 with temperature is studied in the temperature range 10-70 K. In the C band, two narrow ( 6 cm(-1)) lines are are distinguished at distances of 77 and 80 cm(-1) from the exciton line at T

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Morozova, T. P.; Малаховский, Александр Валентинович
}
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13.

Makarov, I. A.
Temperature dependence of the electronic structure of La2CuO4 in the multielectron LDA+GTB approach / I. A. Makarov, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2015. - Vol. 121, Is. 3. - P. 457-464, DOI 10.1134/S1063776115090174. - Cited References: 38. - The work was supported by the Russian Science Foundation (project no. 14-12-00061) . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
Copper oxides
   Model
   Superconductivity
   Excitations
   Instability
   Spectrum
   States
   Order
Аннотация: The band structure of La2CuO4 in antiferromagnetic and paramagnetic phases is calculated at finite temperatures by the multielectron LDA+GTB method. The temperature dependence of the band spectrum and the spectral weight of Hubbard fermions is caused by a change in the occupation numbers of local multielectron spin-split terms in the antiferromagnetic phase. A decrease in the magnetization of the sublattice with temperature gives rise to new bands near the bottom of the conduction band and the top of the valence band. It is shown that the band gap decreases with increasing temperature, but La2CuO4 remains an insulator in the paramagnetic phase as well. These results are consistent with measurements of the red shift of the absorption edge in La2CuO4 with increasing temperature. © 2015, Pleiades Publishing, Inc.

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Публикация на русском языке Макаров, Илья Анатольевич. Температурная зависимость электронной структуры La2CuO4 в многоэлектронном подходе LDA+GTB [Текст] / И. А. Макаров, С. Г. Овчинников // Журн. эксперим. и теор. физ. : Наука, 2015. - Т. 148 Вып. 3. - С. 526-534

Держатели документа:
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
}
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14.

    Majorana zero modes in the coexistence phase of chiral superconductivity and 120°-type magnetic order on the triangular lattice / V. V. Val'kov [et al.] // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 37-40, DOI 10.1016/j.jmmm.2016.12.093. - Cited References: 15. - This study was funded by RFBR according to the research projects Nos. 16-02-00073-a, 16-42-243069-r-mol-a (partly with Government of Krasnoyarsk Territory). A.O.Z. is grateful for support of the Grant of the President of the Russian Federation SP-1370.2015.5. . - ISSN 0304-8853
   Перевод заглавия: Майорановские нулевые моды в фазе сосуществования сверхпроводимости и 120-градусного магнитного порядка на треугольной решетке

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
HUBBARD FERMIONS
   BREAKING
   ENSEMBLE
   STATES
Кл.слова (ненормированные):
Majorana zero modes -- Chiral superconductivity -- Noncollinear magnetic order -- Triangular lattice
Аннотация: We discuss the conditions under which Majorana zero modes can be implemented in the coexistence phase of chiral superconductivity and 120°-type noncollinear spin structure on the triangular lattice. It is shown that the gapless elementary excitations exist on the finite region in the parameter space consisting of the effective exchange field, the chemical potential, and the superconducting order parameter. The range of parameters supporting Majorana edge states with exactly zero excitation energy has also been found.
Обсуждаются условия, при которых в фазе сосуществования киральной сверхпроводимости и неколлинеарной 120-градусной спиновой структуры на треугольной решетке могут реализоваться майорановские нулевые моды. Показано, что бесщелевые элементарные возбуждения существуют в конечной области параметрического пространства, определяемого эффективным обменным полем, химическим потенциалом и сверхпроводящим параметром порядка. Набор параметров, формирующий майорановские краевые состояния со строго равной нулю энергией возбуждения, также был найден.

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Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Zlotnikov, A. O.; Злотников, Антон Олегович; Fedoseev, A. D.; Федосеев, Александр Дмитриевич; Shustin, M. S.; Шустин, Максим Сергеевич; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
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15.

    Kolovsky, A. R.
    Bose-Hubbard Hamiltonian: Quantum chaos approach / A. R. Kolovsky // Int. J. Mod. Phys. B. - 2016. - Vol. 30, Is. 10. - Ст. 1630009, DOI 10.1142/S0217979216300097. - Cited References:42 . - ISSN 0217-9792. - ISSN 1793-6578
   Перевод заглавия: Гамильтониан Бозе-Хаббарда: подход с точки зрения квантового хаоса

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
Optical lattice
   Dynamics
   Atoms
   States
   Model
Кл.слова (ненормированные):
Cold atoms in optical lattices -- quantum transport -- nonlinear dynamics and chaos
Аннотация: We discuss applications of the theory of quantum chaos to one of the paradigm models of many-body quantum physics - the Bose-Hubbard (BH) model, which describes, in particular, interacting ultracold Bose atoms in an optical lattice. After preliminary, pure quantum analysis of the system we introduce the classical counterpart of the BH model and the governing semiclassical equations of motion. We analyze these equations for the problem of Bloch oscillations (BOs) of cold atoms where a number of experimental results are available. The paper is written for nonexperts and can be viewed as an introduction to the field.

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Доп.точки доступа:
Коловский, Андрей Радиевич
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16.

Gluck, M.
Lifetime statistics for a Bloch particle in ac and dc fields / M. . Gluck, A. R. Kolovsky, H. J. Korsch // Phys. Rev. E. - 1999. - Vol. 60, Is. 1. - P. 247-258, DOI 10.1103/PhysRevE.60.247. - Cited References: 27 . - ISSN 1063-651X

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
DYNAMIC LOCALIZATION
   QUANTUM
   TRANSITION
   SCATTERING
   MATRICES
   SYSTEMS
   LADDER
   STATES
   ATOMS
   LIGHT
Аннотация: We study the statistics of the Wigner delay time and resonance width for a Bloch particle in ac and de fields in the regime of quantum chaos. It is shown that after appropriate rescaling the distributions of these quantities have a universal character predicted by the random matrix theory of chaotic scattering. [s1063-651X(99)09907-9].

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Держатели документа:
Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Kolovsky, A. R.; Коловский, Андрей Радиевич; Korsch, H. J.
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17.

Gluck, M.
A quantum cable car for Wannier-Stark ladders / M. . Gluck, A. R. Kolovsky, H. J. Korsch // Phys. Lett. A. - 2000. - Vol. 276, Is. 1-4. - P. 167-174, DOI 10.1016/S0375-9601(00)00656-3. - Cited References: 13 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary
Рубрики:
DYNAMIC LOCALIZATION
   BLOCH PARTICLE
   AC FIELDS
   DC
   STATES
   STATISTICS
   LIFETIME
Кл.слова (ненормированные):
Wannier-Stark ladder -- induced transitions -- Induced transitions -- Wannier-Stark ladder -- article -- energy -- oscillation -- quantum mechanics -- time -- transport kinetics
Аннотация: This Letter studies the dynamics of transitions between the levels of a Wannier-Stark ladder induced by a resonant periodic driving. The analysis of the problem is done in terms of resonance quasienergy states, which take into account the metastable character of the Wannier-Stark states. It is shown that the periodic driving creates from a localized Wannier-Stark state an extended Bloch-like state with a spatial length varying in time as similar to t(1/2). Such a state can find applications in the field of atomic optics because it generates a coherent pulsed atomic beam. (C) 2000 Elsevier Science B.V. All rights reserved.

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Держатели документа:
Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Fachbereich Physik, Universitat Kaiserslautern, D-67653 Kaiserslautern, Germany
L.V. Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Kolovsky, A. R.; Коловский, Андрей Радиевич; Korsch, H. J.
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18.

Gavrichkov, V. A.
Low-energy electron spectrum in copper oxides in the multiband p-d model / V. A. Gavrichkov, S. G. Ovchinnikov // Phys. Solid State. - 1998. - Vol. 40, Is. 2. - P. 163-168, DOI 10.1134/1.1130262. - Cited References: 31 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TC SUPERCONDUCTORS
   SR2CUO2CL2
   STATES
   PLANES
Аннотация: An exact diagonalization of the Hamiltonian in the p-d model of a CuO6 cluster was used to obtain dependences on the model parameters of the lowest-energy two-hole terms: the energy difference between the 2p orbitals of planar and apical oxygen Delta(apex) = epsilon(2p) - epsilon[2p(apex)], the crystal field parameter Delta(d) = epsilon(3z2-r2)-epsilon(x2-y2), and the ratio of the distances between the copper atom and the apical and planar oxygen atoms d(apex)/d(pl). In the limit of large d(apex)/d(pl) and Delta(d), OUT model is equivalent to the three-band p-d model and, in this case, large singlet-triplet splitting Delta epsilon greater than or equal to 1 eV is also observed. As the parameters decrease, a singlet-triplet crossover is observed. Two mechanisms are identified for stabilization of the tripler term B-3(1g)(0) as the ground state. It is shown that for realistic values of the parameters, reduction of the p-d model to the three-band model is limited by the low energies of the current excitations because of the presence of the lower excited B-3(1g), and (1)A(1g) cluster states. Intercluster hopping causes strong mixing of singlet and triplet states far from the Gamma point. The results of the calculations are compared with data obtained by angle-resolved photoelectron emission in Sr2CuO2Cl2. (C) 1998 American Institute of Physics.

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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович
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19.

Fedoseev, A. D.
Realization conditions and the magnetic field dependence of corner excitations in the topological insulator with superconducting coupling on the triangular lattice / A. D. Fedoseev // J. Exp. Theor. Phys. - 2021. - Vol. 133, Is. 1. - P. 71-76, DOI 10.1134/S1063776121060029. - Cited References: 38. - This work was supported by the Russian Foundation for Basic Research (project no. 19-02-00348), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects: "Study of edge states in oneand two-dimensional topological superconductors" (no. 20-42-243005), "Coulomb interactions in the problem of Majorana modes in low-dimensional systems with nontrivial topology" (no. 19-42-240011), and Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (Project MK1641.2020.2) . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
Рубрики:
EDGE
STATES
ORDER
Аннотация: The studies of the topological properties of systems have recently been extended due to a new concept of higher-order topological insulators and superconductors. Many models were proposed for two-dimensional systems on a square lattice, where corner excitations can appear; however, the problem of existence of such excitations in superconducting systems with a triangular crystal lattice is still poorly understood. Using a topological insulator in the form of a triangle with a chiral superconducting order parameter as an example, we shows that corner excitations can exist in C3-symmetric systems. In spite of a nontopological character, these excitations have energies inside the gap of the first-order edge excitation spectrum over a wide parameter range and are well localized at the corners of the system. Gapless corner excitations are shown to exist in the system at certain parameters. The application of a magnetic field in the system plane removes the triple degeneracy of the corner excitation energy and makes it possible to control the position of the minimum-energy corner excitation using a magnetic field. At the same time the fine adjustment to achieve the gapless excitations at the chosen corner can be made with changing of the magnetic field value.

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Публикация на русском языке Федосеев, Александр Дмитриевич. Условия реализации и магнитополевая зависимость угловых возбуждений в топологическом изоляторе со сверхпроводящим спариванием на треугольной решетке [Текст] / А. Д. Федосеев // Журн. эксперим. и теор. физ. - 2021. - Т. 160 Вып. 1. - С. 88-94

Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Федосеев, Александр Дмитриевич; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory [19-02-00348]; Krasnoyarsk Regional Fund of Science [20-42-243005]; "Coulomb interactions in the problem of Majorana modes in low-dimensional systems with nontrivial topology" [19-42-240011]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific SchoolsLeading Scientific Schools Program [MK1641.2020.2]
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20.

Experimental implementation of tunable hybrid Tamm-microcavity modes / P. S. Pankin, V. S. Sutormin, V. A. Gunyakov [et al.] // Appl. Phys. Lett. - 2021. - Vol. 119, Is. 16. - Ст. 161107, DOI 10.1063/5.0067179. - Cited References: 60. - The authors are grateful to M. N. Krakhalev for helpful discussions. Electrical control of hybrid modes was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research, Project No. 19-42-240004. Temperature control of hybrid modes was funded by Russian Foundation for Basic Research, Project No. 19-52-52006 and No. MOST 108-2923-E-009-003-MY3, Taiwan. P. S. Pankin is grateful for the support of the President of the Russian Federation under Grant No. MK-4012.2021.1.2. This study was supported by the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center KSC SB RAS . - ISSN 0003-6951. - ISSN 1077-3118

РУБ Physics, Applied
Рубрики:
STATES
CRYSTALS
LAYER
Аннотация: Mode hybridization is a unique way to manipulate the mode inside a fixed cavity or at interface. For example, Tamm plasmon-polariton at solid interface can be spectrally shifted without tuning the interface. Experimental implementation of tunable hybrid Tamm-microcavity modes is reported. The hybrid modes are excited in a one-dimensional photonic crystal bounded with a gold layer by attaching a nematic liquid crystal microcavity. Coupling between Tamm plasmon-polariton and microcavity modes leads to repulsion of their dispersion curves controlled by the refractive index of a liquid crystal and the polarization of incident light. Effective tuning of hybrid modes through heating or applying an external electric field to the liquid crystal layer is demonstrated. The experimentally measured strength coupling value between Tamm and microcavity modes was 20.7 meV.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
AO NPP Radiosvyaz, Krasnoyarsk 660021, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.
Natl Yang Ming Chiao Tung Univ, Tainan 71150, Taiwan.

Доп.точки доступа:
Pankin, P. S.; Панкин, Павел Сергеевич; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Gunyakov, V. A.; Гуняков, Владимир Алексеевич; Zelenov, F. V.; Tambasov, I. A.; Тамбасов, Игорь Анатольевич; Masyugin, A. N.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Baron, F. A.; Барон, Филипп Алексеевич; Chen, K. P.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund [19-42-240004]; Russian Foundation for Basic Research, TaiwanRussian Foundation for Basic Research (RFBR) [19-52-52006, MOST 108-2923-E-009-003-MY3]; Russian FederationRussian Federation [MK-4012.2021.1.2]; Krasnoyarsk Regional Center of Research Equipment of Federal Research Center KSC SB RAS
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