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Aksenov, S. V.
Strong Coulomb interactions in the problem of Majorana modes in a wire of the nontrivial topological class BDI / S. V. Aksenov, A. O. Zlotnikov, M. S. Shustin // Phys. Rev. B. - 2020. - Vol. 101, Is. 12. - Ст. 125431, DOI 10.1103/PhysRevB.101.125431. - Cited References: 60. - We acknowledge fruitful discussions with V. V. Valkov and V. A. Mitskan. The reported study was funded by the RAS Presidium programs for fundamental research Nos. 12 and 32, Russian Foundation for Basic Research (Projects No. 18-32-00443 and No. 19-02-00348), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project: "Coulomb interactions in the problem of Majorana modes in low-dimensional systems with nontrivial topology" (Grant No. 19-42-240011). S.V.A. and A.O.Z. are grateful to the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, Projects No. MK-1641.2020.2 and No. MK-3594.2018.2. S.V.A. acknowledges the support from the Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS" (Grant No. 18-46-007). . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
QUANTUM
   POLARIZATION
   TRANSITION
   FERMIONS
   SPECTRUM
   STATE
Аннотация: In this study, the problem of strong Coulomb interactions in topological superconducting wire is analyzed by means of the density-matrix-renormalization-group (DMRG) approach. To analyze properties of edge states in the BDI-class structure, a quantity called Majorana polarization is used. From its dependence on wire length and an entanglement-spectrum degeneracy, topological phase diagrams are obtained. The DMRG calculations for the Shubin-Vonsovsky-type model of the wire show the transformation of phases with Majorana single and double modes (MSMs and MDMs, respectively) under the increase of onsite and intersite correlations. In particular, we demonstrate different scenarios including the possibilities of both induction and suppression of the MSMs and MDMs. It is shown that in the strongly correlated regime, the contributions of single-particle excitations to the Majorana-type states significantly decrease at low magnetic fxields. Moreover, the t-J*-V model is derived allowing to study the effective interactions and improve the DMRG numerics. It is found out that in the limiting case of the effective Hamiltonian with infinitely strong onsite repulsion, t model, the topological phases are destroyed. Finally, the ways to probe the MSMs and MDMs via the features of caloric functions are discussed.

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

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Shustin, M. S.; Шустин, Максим Сергеевич; Аксенов, Сергей Владимирович; RAS Presidium programs for fundamental research [32, 12]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-32-00443, 19-02-00348]; Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [19-42-240011]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific SchoolsLeading Scientific Schools Program [MK-1641.2020.2, MK-3594.2018.2]; Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS" [18-46-007]
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Atomic current across an optical lattice / A. V. Ponomarev [et al.] // Phys. Rev. Lett. - 2006. - Vol. 96, Is. 5. - Ст. 50404, DOI 10.1103/PhysRevLett.96.050404. - Cited References: 18 . - ISSN 0031-9007

РУБ Physics, Multidisciplinary

Кл.слова (ненормированные):
Crystal lattices -- Electric conductance -- Fermions -- Switches -- Atomic current -- Microscopic dynamics -- Optical lattices -- Atomic physics
Аннотация: We devise a microscopic model for the emergence of a collision-induced, fermionic atomic current across a tilted optical lattice. Tuning the-experimentally controllable-parameters of the microscopic dynamics allows us to switch from Ohmic to negative differential conductance.

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Держатели документа:
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Tech Univ Munich, Dept Phys, D-85747 Garching, Germany
ИФ СО РАН
Max-Planck-Institut fur Physik Komplexer Systeme, Nothnitzer Stra?e 38, 01187 Dresden, Germany
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Physik Department, Technische Universitat Munchen, James-Franck-Stra?e, 85747 Garching, Germany

Доп.точки доступа:
Ponomarev, A. V.; Madronero, J.; Kolovsky, A. R.; Коловский, Андрей Радиевич; Buchleitner, A.
}
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Coupling of Hubbard fermions with phonons in La2 CuO4: A combined study using density-functional theory and the generalized tight-binding method / E. I. Shneyder [et al.] // J. Alloys Compd. - 2015. - Vol. 648. - P. 258-264, DOI 10.1016/j.jallcom.2015.05.150. - Cited References: 60. - We acknowledge the stimulating discussions with V.V. Val'kov, D.M. Dzebisashvilly, M.M. Korshunov and I.S. Sandalov. E.I.S. and S.G.O. are thankful to the Russian Science Foundation (project No. 14-12-00061) for the support of the research given in Sections 2, 6 and 7. E.E.K. and I.A.N. are thankful to the State Contract No. 0389-2014-0001 and RFBR grant No. 14-02-00065 for the support of the research given in Section 5. Financial support of the research given in Sections 3 and 4 by the Austrian Federal Government (in particular from Bundesministerium fur Verkehr, Innovation und Technologie and Bundesministerium fur Wissenschaft, Forschung und Wirtschaft) represented by Osterreichische Forschungsforderungsgesellschaft mbH and the Styrian and the Tyrolean Provincial Government, represented by Steirische Wirtschaftsforderungsgesellschaft mbH and Standortagentur Tirol, within the framework of the COMET Funding Programme is gratefully acknowledged by C.D. and J.S. . - ISSN 0925-8388

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
MEAN-FIELD THEORY
   LINEAR-RESPONSE THEORY
   CUPRATE SUPERCONDUCTORS
   ELECTRONIC-STRUCTURE
   CORRELATED SYSTEMS
   LATTICE-DYNAMICS
   BAND-STRUCTURE
   LA2CUO4
   MODEL
   LA2-XSRXCUO4
Кл.слова (ненормированные):
High-temperature superconductivity -- Electron-phonon coupling -- Density-functional theory -- Generalized tight-binding approach
Аннотация: We present results for the electron-phonon interaction of the Γ-point phonons in the tetragonal high-temperature phase of La2 CuO4 obtained from a hybrid scheme, combining density-functional theory (DFT) with the generalized tight-binding approach. As a starting point, eigenfrequencies and eigenvectors for the Γ-point phonons are determined from DFT within the frozen phonon approach utilizing the augmented plane wave + local orbitals method. The so obtained characteristics of electron-phonon coupling are converted into parameters of the generalized tight-binding method. This approach is a version of cluster perturbation theory and takes the strong on-site electron correlations into account. The obtained parameters describe the interaction of phonons with Hubbard fermions which form quasiparticle bands in strongly correlated electron systems. As a result, it is found that the Γ-point phonons with the strongest electron-phonon interaction are the A2u modes (236 cm-1, 131 cm-1 and 476 cm-1). Finally it is shown, that the single-electron spectral-weight redistribution between different Hubbard fermion quasiparticles results in a suppression of electron-phonon interaction which is strongest for the triplet Hubbard band with z oriented copper and oxygen electrons. © 2015 Elsevier B.V. All rights reserved.

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Держатели документа:
Kirensky Institute of Physics SB RAS, Akademgorodok 50, Bld. 38, Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk, Russian Federation
Materials Center Leoben Forschung GmbH, Rosegger-Stra?e 18, Leoben, Austria
Institute of Electrophysics UB RAS, Amundsena Str. 106, Yekaterinburg, Russian Federation
Physics Department and IRIS Adlershof, Humboldt-Universita¨t zu Berlin, Zum Großen Windkanal 6, Berlin, Germany

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Spitaler, J.; Kokorina, E. E.; Nekrasov, I. A.; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Draxl, C.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Edge states and Majorana modes in condensed matter / V. V. Val'kov [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. I1.14. - P. 31. - References: 3 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
majorana fermions -- edge states -- triangular lattice -- honeycomb lattice -- electronic transport

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Aksenov, S. V.; Аксенов, Сергей Владимирович; Zlotnikov, A. O.; Злотников, Антон Олегович; Fedoseev, A. D.; Федосеев, Александр Дмитриевич; Shustin, M. S.; 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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Kinematic mechanism of the modulation of the spectral intensity in the spatially uniform system of Hubbard fermions / V. V. Val'kov, A. A. Golovnya, M. M. Korovushkin // Journal of Experimental and Theoretical Physics Letters (JETP Letters). - 2011. - Т. 94, № 3. - P197-201, DOI 10.1134/S0021364011150148 . - ISSN 0021-3640. - ISSN 1090-6487

РИНЦ
Держатели документа:
Kirensky Institute of Physics, Siberian Branch,Russian Academy of Sciences
Reshetnev Siberian State Aerospace University

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Golovnya, A.A.; Korovushkin, M.M.
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    Kolovsky, A. R.
    Evaporative Cooling and Self-Thermalization in an Open System of Interacting Fermions / A. R. Kolovsky, D. L. Shepelyansky // Ann. Phys.-Berlin. - 2019. - Vol. 531, Is. 12. - Ст. 1900231, DOI 10.1002/andp.201900231. - Cited References: 24. - For D.L.S. this work was supported in part by the Programme Investissements d'Avenir ANR-11-IDEX-0002-02, reference ANR-10-LABX-0037-NEXT (project THETRACOM). For A.R.K. this work was supported in part by Russian Science Foundation through the grant N19-12-00167. . - ISSN 0003-3804. - ISSN 1521-3889
   Перевод заглавия: Испарительное охлаждение и само-термализация в открытой системе взаимодействующих фермионов
Рубрики:
QUANTUM CHAOS
   DISTRIBUTIONS
   STATISTICS
Кл.слова (ненормированные):
open quantum systems -- quantum chaos -- self-thermalization
Аннотация: Depletion dynamics of an open system of weakly interacting fermions with two-body random interactions is studied. In this model, fermions are escaping from the high-energy one-particle orbitals, that mimics the evaporation process used in laboratory experiments with neutral atoms to cool them to ultra-low temperatures. It is shown that due to self-thermalization the system instantaneously adjusts to the new temperature which decreases with the course of time.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Univ Toulouse, UPS, Lab Phys Theor, IRSAMC,CNRS, F-31062 Toulouse, France

Доп.точки доступа:
Shepelyansky, Dima L.; Коловский, Андрей Радиевич; Programme Investissements d'AvenirFrench National Research Agency (ANR) [ANR-11-IDEX-0002-02, ANR-10-LABX-0037-NEXT]; Russian Science FoundationRussian Science Foundation (RSF) [N19-12-00167]
}
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Korshunov, M. M.
Doping-dependent evolution of low-energy excitations and quantum phase transitions within an effective model for high-T-c copper oxides / M. M. Korshunov, S. G. Ovchinnikov // Eur. Phys. J. B. - 2007. - Vol. 57, Is. 3. - P. 271-278, DOI 10.1140/epjb/e2007-00179-2. - Cited References: 49 . - ISSN 1434-6028

РУБ Physics, Condensed Matter
Рубрики:
ELECTRON CORRELATIONS
   HUBBARD-MODEL
   RANGE-ORDER
   DIMENSIONS
   WAVE
   FERMIONS
   SYSTEMS
   BANDS
   METAL
Кл.слова (ненормированные):
Doping dependent evolution -- Kinematic correlation functions -- Low energy excitations -- Quantum phase transitions -- Doping (additives) -- Electric excitation -- Mean field theory -- Parameter estimation -- Phase transitions -- Quantum theory -- Copper oxides
Аннотация: In this paper a mean-field theory for the spin-liquid paramagnetic non-superconducting phase of the p- and n-type high-T-c cuprates is developed. This theory applied to the effective t-t'-t ''-J* model with the ab initio calculated parameters and with the three-site correlated hoppings. The static spin-spin and kinematic correlation functions beyond Hubbard-I approximation are calculated self-consistently. The evolution of the Fermi surface and band dispersion is obtained for the wide range of doping concentrations x. For p-type systems the three different types of behavior are found and the transitions between these types are accompanied by the changes in the Fermi surface topology. Thus a quantum phase transitions take place at x = 0.15 and at x = 0.23.Due to the different Fermi surface topology we found for n-type cuprates only one quantum critical concentration, x = 0.2. The calculated doping dependence of the nodal Fermi velocity and the effective mass are in good agreement with the experimental data.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Max-Planck-Institut fur Physik Komplexer Systeme, 01187 Dresden, Germany

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Коршунов, Максим Михайлович
}
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    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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Nonanalytic Spin Susceptibility of a Fermi Liquid: The Case of Fe-Based Pnictides / M. M. Korshunov [et al.] // Phys. Rev. Lett. - 2009. - Vol. 102, Is. 23. - Ст. 236403, DOI 10.1103/PhysRevLett.102.236403. - Cited References: 41. - We thank R. Klingeler for useful discussions. M. M. K. acknowledges support from RFBR ( 09-02-00127) and the OFN RAS program on "Strong electronic correlations". I. E. acknowledges partial support from APCTP, NSF-DMR ( 0645461), and the RMHE Program ( Contract No. 2.1.1/3199). D. L. M. acknowledges support from Laboratoire de Physique des Solides, Universite Paris-Sud ( France) and RTRA Triangle de la Physique. A. V. C. acknowledges support from NSF-DMR 0604406. . - ISSN 0031-9007

РУБ Physics, Multidisciplinary
Рубрики:
PHASE-TRANSITIONS
QUANTUM
Кл.слова (ненормированные):
Electron pockets -- Fermi energy -- Linear temperature dependence -- Pnictides -- Prefactor -- Quantitative agreement -- Spin susceptibility -- Temperature dependence -- Fermi liquids -- Fermions -- Liquids -- Magnetic susceptibility -- Temperature distribution -- Spin dynamics
Аннотация: We propose an explanation of the peculiar linear temperature dependence of the uniform spin susceptibility chi(T) in ferropnictides. We argue that the linear in T term appears to be due to the nonanalytic temperature dependence of chi(T) in a two-dimensional Fermi liquid. We show that the prefactor of the T term is expressed via the square of the spin-density-wave (SDW) amplitude connecting nested hole and electron pockets. Because of an incipient SDW instability, this amplitude is large, which, along with a small value of the Fermi energy, makes the T dependence of chi(T) strong. We demonstrate that this mechanism is in quantitative agreement with the experiment.

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Держатели документа:
[Korshunov, M. M.
Eremin, I.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Korshunov, M. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Eremin, I.] Tech Univ Carolo Wilhelmina Braunschweig, Inst Math & Theoret Phys, D-38106 Braunschweig, Germany
[Efremov, D. V.] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden, Germany
[Maslov, D. L.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[Chubukov, A. V.] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
ИФ СО РАН
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany
L. V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Institute fur Mathematische und Theoretische Physik, Technische Universitat Braunschweig, 38106 Braunschweig, Germany
Institut fur Theoretische Physik, Technische Universitat Dresden, 01062 Dresden, Germany
Department of Physics, University of Florida, Gainesville, FL 32611, United States
Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, United States
Kazan State University, 420087 Kazan, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Eremin, I.; Efremov, D. V.; Maslov, D. L.; Chubukov, A. V.; RFBR [09-02-00127]; OFN RAS; APCTP; NSF-DMR [0645461, 0604406]; RMHE [2.1.1/3199]; Laboratoire de Physique des Solides, Universite Paris-Sud (France); RTRA Triangle de la Physique
}
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10.

    Occurrence of Topologically Nontrivial Phases, Cascade of Quantum Transitions, and Identification of Majorana Modes in Chiral Superconductors and Nanowires (Scientific Summary) / V. V. Val'kov [et al.] // JETP Letters. - 2019. - Vol. 110, Is. 2. - P. 140-153, DOI 10.1134/S002136401914011X. - Cited References: 88. - This work was supported by the Russian Foundation for Basic Research (project nos. 16-02-00073, 18-32-00443, 19-02-00348) and jointly by the Government of the Krasnoyarsk Territory, the Krasnoyarsk Regional Fund of Science (project no. 18-42-243017, "Manifestation of Coulomb Interactions and Effects of Bounded Geometry in the Properties of Topological Edge States of Nanostructures with Spin-Orbit Interaction"; project no. 18-42-243018, "Contact Phenomena and Magnetic Disorder in the Problem of the Formation and Detection of Topologically Protected Edge States in Semiconductor Nanostructures"; and project no. 18-42-240014, "Single-Orbit Effective Model of an Ensemble of Spin-Polaron Quasiparticles in the Problem of Describing the Intermediate State and Pseudogap Behavior of Cuprate Superconductors"). S.V. Aksenov and A. O. Zlotnikov acknowledge the support of the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project nos. MK-3722.2018.2 and MK-3594.2018.2). . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
HUBBARD FERMIONS
   BOUND-STATE
   SPIN
   POLARIZATION
   COEXISTENCE
Аннотация: The problems of occurrence and experimental identification of topologically nontrivial phases in condensed matter have been reviewed. The results of the study of the effect of strong intra- and interatomic Coulomb interaction on a quantum phase transition with change in the topological index in an ensemble of Hubbard fermions on a triangular lattice have been reported. Nontrivial topology of the phase of coexistence of d + id chiral superconductivity and 120° spin ordering in a system with the triangular lattice has been discussed and the formation of Majorana modes in such a phase has been demonstrated. A cascade of quantum transitions that occurs at the variation of the magnetic field or the electrochemical potential has been analyzed for an open nanowire with the Rashba spin-orbit coupling and the induced superconducting pairing potential. It has been shown that anomalies of magneto- and electrocaloric effects are manifested near such quantum transitions and can be used to experimentally test materials on the existence of topologically nontrivial phases in them. The switching of the spin-polarized current in the topological superconducting phase has been predicted for a semimetal/superconducting wire/semimetal structure in the weak nonequilibrium regime.

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Публикация на русском языке

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Fed Res Ctr KSC, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Mitskan, V. A.; Мицкан, Виталий Александрович; Zlotnikov, A. O.; Злотников, Антон Олегович; Shustin, M. S.; Шустин, Максим Сергеевич; Aksenov, S. V.; Аксенов, Сергей Владимирович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [16-02-00073, 18-32-00443, 19-02-00348]; Government of the Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [18-42-243017, 18-42-243018, 18-42-240014]; Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific SchoolsLeading Scientific Schools Program [MK-3722.2018.2, MK-3594.2018.2]
}
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