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Kolovsky, A. R.
Wannier-Stark states and Bloch oscillations in the honeycomb lattice / A. R. Kolovsky, E. N. Bulgakov // Phys. Rev. B. - 2013. - Vol. 87, Is. 3. - Ст. 033602. - P. , DOI 10.1103/PhysRevA.87.033602 . - ISSN 1050-2947
Кл.слова (ненормированные):
Bloch oscillations -- Chaotic state -- Honeycomb lattices -- Localization length -- Localized state -- Quantum particles -- Static fields -- Tight-binding approximations -- Solid state physics -- Honeycomb structures
Аннотация: We study a quantum particle in a tilted honeycomb lattice in the tight-binding approximation. First we discuss the particle eigenstates, i.e., the stationary Wannier-Stark states. These states are proved to be extended states for the rational directions of the static field and localized states for the irrational directions. We find energy bands of the extended states and analyze the localized states. It is shown, in particular, that the localized honeycomb Wannier-Stark states are chaotic states with irregular dependence of the localization length on the static field magnitude. Second we discuss Bloch oscillations of the quantum particle. Irregular Bloch oscillations for irrational directions are observed. В© 2013 American Physical Society.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Bulgakov, E. N.; Булгаков, Евгений Николаевич; Коловский, Андрей Радиевич
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Sadreev, A. F.
Two-Electron Bound States in a Continuum in Quantum Dots / A. F. Sadreev, T. V. Babushkina // JETP Letters. - 2008. - Vol. 88, Is. 5. - P. 312-317, DOI 10.1134/S0021364008170050. - Cited References: 30 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
LOCALIZED MAGNETIC STATES
METALS
Аннотация: A bound state in a continuum (BIC) might appear in open quantum dots for the variation in the dot's shape. By means of the equations of motion of the Green's functions, we investigate the effect of strong intradot Coulomb interactions on that phenomenon within the framework of(he impurity Anderson model. The equation that the imaginary part of the poles of the Green's function equals zero yields the condition for BICs. As a result, we show that the Coulomb interactions replicate the single-electron BICs into two-electron ones.

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Держатели документа:
[Sadreev, A. F.] Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
[Babushkina, T. V.] Siberian Fed Univ, Krasnoyarsk 660079, Russia
ИФ СО РАН
Institute of Physics, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660079, Russian Federation

Доп.точки доступа:
Babushkina, T. V.; Садреев, Алмаз Фаттахович
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Bikbaev, R. G.
Two types of localized states in a photonic crystal bounded by an epsilon near zero nanocomposite / R. G. Bikbaev, S. Y. Vetrov, I. V. Timofeev // Photonics. - 2018. - Vol. 5, Is. 3. - Ст. 22, DOI 10.3390/photonics5030022. - Cited References: 53 . - ISSN 2304-6732
Кл.слова (ненормированные):
Photonic crystal -- Nanocomposite -- Epsilon near zero material -- Tamm plasmon polariton
Аннотация: The spectral properties of a one-dimensional photonic crystal bounded by a resonant absorbing nanocomposite layer with the near-zero permittivity have been studied. The problem of calculating the transmittance, reflectance, and absorptance spectra of such structures at the normal and oblique incidence of light has been solved. It is shown that, depending on the permittivity sign near zero, the nanocomposite is characterized by either metallic or dielectric properties. The possibility of simultaneous formation of the Tamm plasmon polariton at the photonic crystal/metallic nanocomposite interface and the localized state similar to the defect mode with the field intensity maximum inside the dielectric nanocomposite layer is demonstrated. Specific features of field localization at the Tamm plasmon polariton and defect mode frequencies are analyzed. © 2018 by the authors.

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Держатели документа:
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Polytechnic Institute, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, I. V.; Тимофеев, Иван Владимирович
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Bulgakov, E. N.
Symmetry breaking for transmission in a photonic waveguide coupled with two off-channel nonlinear defects / E. N. Bulgakov, K. N. Pichugin, A. F. Sadreev // Phys. Rev. B. - 2011. - Vol. 83, Is. 4. - Ст. 45109, DOI 10.1103/PhysRevB.83.045109. - Cited References: 50. - This work was partially supported by RFBR Grant No. 09-02-98005-"Siberia" and RFBR Grant No. 11-02-00289. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL-CIRCUITS
   LOCALIZED MODES
   BISTABILITY
   IMPURITIES
   RESONANCE
   CAVITIES
   STATES
   MEDIA
Аннотация: We consider light transmission in a two-dimensional (2D) photonic crystal waveguide coupled with two identical nonlinear defects positioned symmetrically aside the waveguide. With the coupled mode theory, we show three scenarios for the transmission. The first one inherits the linear case and preserves the symmetry. In the second scenario, the symmetry is broken because of different light intensities at the defects. In the third scenario, the intensities at the defects are equal but phases of complex amplitudes are different. That results in a vortical power flow between the defects similar to the dc Josephson effect if the input power over the waveguide is applied and the defects are coupled. All of these phenomena agree well with computations based on an expansion of the electromagnetic field into optimally adapted photonic Wannier functions in a 2D photonic crystal.

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Держатели документа:
[Bulgakov, Evgeny
Pichugin, Konstantin
Sadreev, Almas] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Bulgakov, Evgeny] Siberian State Aerosp Univ, Krasnoyarsk, Russia

Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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Spectrum of localized states in graphene quantum dots and wires / V. V. Zalipaev [et al.] // Phys. Lett. A. - 2013. - Vol. 377, Is. 3-4. - P. 216-221, DOI 10.1016/j.physleta.2012.11.028 . - ISSN 0375-9601
Кл.слова (ненормированные):
Generalized Bohr-Sommerfeld quantization condition -- Graphene -- High-energy eigenstates -- Semiclassical approximation -- Tunneling
Аннотация: We developed semiclassical method and show that any smooth potential in graphene describing elongated a quantum dot or wire may behave as a barrier or as a trapping well or as a double barrier potential, Fabry-Perot structure, for 1D Schrodinger equation. The energy spectrum of quantum wires has been found and compared with numerical simulations. We found that there are two types of localized states, stable and metastable, having finite life time. These life times are calculated, as is the form of the localized wave functions which are exponentially decaying away from the wire in the perpendicular direction. В© 2012 Elsevier B.V. All rights reserved.

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Держатели документа:
Univ Loughborough, Dept Math Sci, Loughborough LE11 3TU, Leics, England
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Loughborough, Dept Phys, Loughborough LE11 3TU, Leics, England

Доп.точки доступа:
Zalipaev, V. V.; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Linton, C. M.; Kusmartsev, F. V.
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Vetrov, S. Ya.
Spectral and polarization properties of a ‘cholesteric liquid crystal—phase plate—metal’ structure / S. Y. Vetrov, M. V. Pyatnov, I. V. Timofeev // J. Opt. - 2016. - Vol. 18, Is. 1. - Ст. 015103, DOI 10.1088/2040-8978/18/1/015103. - Cited References:34. - This work was supported by the Russian Foundation for Basic Research, project no. 14-02-31248, and the Ministry of Education and Science of the Russian Federation, Government program, project no. 3.1276.2014/K. . - ISSN 2040-8978. - ISSN 2040-8986

РУБ Optics
Рубрики:
OPTICAL TAMM STATES
MODES
LIGHT
Кл.слова (ненормированные):
photonic band gap materials -- cholesteric liquid crystals -- localized -- states -- optical filters -- optical waveguides
Аннотация: We investigate the localized surface modes in a structure consisting of the cholesteric liquid crystal layer, a phase plate, and a metal layer. These modes are analogous to the optical Tamm states. The nonreciprocal transmission of polarized light propagating in the forward and backward directions is established. It is demonstrated that the transmission spectrum can be controlled by external fields acting on the cholesteric liquid crystal and by varying the plane of polarization of the incident light.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Siberian Fed Univ, Lab Nonlinear Opt & Spect, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Pyatnov, M. V.; Timofeev, I. V.; Тимофеев, Иван Владимирович; Ветров, Степан Яковлевич; Russian Foundation for Basic Research [14-02-31248]; Ministry of Education and Science of the Russian Federation, Government program [3.1276.2014/K]
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Refractory titanium nitride two-dimensional structures with extremely narrow surface lattice resonances at telecommunication wavelengths / V. I. Zakomirnyi [et al.] // Appl. Phys. Lett. - 2017. - Vol. 111, Is. 12. - Ст. 123107, DOI 10.1063/1.5000726. - Cited References: 54. - This work was supported by the RF Ministry of Education and Science, the State contract with Siberian Federal University for scientific research in 2017–2019. Numerical calculations were performed using the MVS-1000M system at the Institute of Computational Modeling of the Siberian Branch of the Russian Academy of Sciences. . - ISSN 0003-6951
Кл.слова (ненормированные):
Bandwidth -- Nanoparticles -- Nanostructures -- Optical properties -- Plasmons -- Q factor measurement -- Refractory materials -- Titanium compounds -- Diffractive grating -- Electromagnetic response -- Localized surface plasmon -- Low cost fabrication -- Plasmonic nanoparticle -- Telecommunication bandwidth -- Telecommunication wavelengths -- Two-dimensional structures -- Titanium nitride
Аннотация: Regular arrays of plasmonic nanoparticles have brought significant attention over the last decade due to their ability to support localized surface plasmons (LSPs) and exhibit diffractive grating behavior simultaneously. For a specific set of parameters (i.e., period, particle shape, size, and material), it is possible to generate super-narrow surface lattice resonances (SLRs) that are caused by interference of the LSP and the grating Rayleigh anomaly. In this letter, we propose plasmonic structures based on regular 2D arrays of TiN nanodisks to generate high-Q SLRs in an important telecommunication range, which is quite difficult to achieve with conventional plasmonic materials. The position of the SLR peak can be tailored within the whole telecommunication bandwidth (from ≈ 1.26 μm to ≈ 1.62 μm) by varying the lattice period, while the Q-factor is controlled by changing nanodisk sizes. We show that the Q-factor of SLRs can reach a value of 2 × 103, which is the highest reported Q-factor for SLRs at telecommunication wavelengths so far. Tunability of optical properties, refractory behavior, and low-cost fabrication of TiN nanoparticles paves the way for manufacturing cheap nanostructures with extremely stable and adjustable electromagnetic response at telecommunication wavelengths for a large number of applications.

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Держатели документа:
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, Russian Federation
Division of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, Stockholm, Sweden
Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, United States
Institute of Computational Modeling, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian State University of Science and Technology, Krasnoyarsk, Russian Federation
L. V. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Zakomirnyi, V. I.; Rasskazov, I. L.; Gerasimov, V. S.; Герасимов, Валерий Сергеевич; Ershov, A. E.; Ершов, Александр Евгеньевич; Polyutov, S. P.; Karpov, S. V.; Карпов, Сергей Васильевич
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Ivantsov, I. D.
Quantum Monte Carlo study of the itinerant-localized model of strongly correlated electrons: Spin-spin correlation functions / I. Ivantsov, A. Ferraz, E. Kochetov // Phys. Rev. B. - 2016. - Vol. 94, Is. 23. - Ст. 235118, DOI 10.1103/PhysRevB.94.235118. - Cited References: 15 . - ISSN 1098-0121
Аннотация: We perform quantum Monte Carlo simulations of the itinerant-localized periodic Kondo-Heisenberg model for the underdoped cuprates to calculate the associated spin correlation functions. The strong electron correlations are shown to play a key role in the abrupt destruction of the quasi-long-range antiferromagnetic order in the lightly doped regime. © 2016 American Physical Society.

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Держатели документа:
L. V. Kyrensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Russian Federation
International Institute of Physics - UFRN, Department of Experimental and Theoretical Physics, UFRN, Natal, Brazil

Доп.точки доступа:
Ferraz, A.; Kochetov, E.; Иванцов, Илья Дмитриевич
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Kuzmin, E. V.
Paramagnetic-susceptibility and phonon instability of metal with localized and collectivized electron state mixing / E. V. Kuzmin, S. G. Ovchinnikov, I. S. Sandalov // Fiz. Tverd. Tela. - 1980. - Vol. 22, Is. 2. - P. 424-430. - Cited References: 22 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Sandalov, I. S.; Сандалов, Игорь Семёнович; Кузьмин, Евгений Всеволодович
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10.

Piatnov, M. V.
Optical localized states in the liquid crystal structure bordering on the metal / M. V. Piatnov, S. Ya. Vetrov, I. V. Timofeev // 6th Workshop on Liq. Cryst. for Photon. / program-book. - 2016. - Ст. PO11. - P. . 53. - Библиогр.: 2

Материалы конференции,
Материалы конференции

Доп.точки доступа:
Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Workshop on Liquid Crystals for Photonics(6 ; Sept. 14 - 16, 2016 ; Ljubljana, Slovenia)
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