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Val'kov, V. V.
Coexistence of the chiral superconductivity and noncollinear magnetic order in the ensemble of Hubbard fermions on a triangular lattice / V. V. Val'kov, A. O. Zlotnikov // JETP Letters. - 2016. - Vol. 104, Is. 7. - P. 483-488, DOI 10.1134/S0021364016190127. - Cited References: 24. - This work was supported by the Russian Foundation for Basic Research (project no. 16-02-00073-a), by the Government of Krasnoyarsk Krai (project no. 16-42-243069-r-mol-а), and by the Siberian Branch, Russian Academy of Sciences (project no. 0358-2015-0002, Complex Program II.2P). The work of A.O.Z. was supported by the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project no. SP-1370.2015.5). . - ISSN 0021-3640
Аннотация: For the system of strongly correlated electrons on a triangular lattice, the possibility of coexisting superconductivity with the chiral order parameter and the 120°-type noncollinear spin ordering is demonstrated. The integral self-consistency equation for the superconducting order parameter is derived using the diagram technique for Hubbard operators taking into account the spin structure, exchange interaction within two coordination spheres, and intersite Coulomb repulsion. © 2016, Pleiades Publishing, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Сосуществование киральной сверхпроводимости и неколлинеарного магнитного порядка в ансамбле фермионов Хаббарда на треугольной решетке [Текст] / В. В. Вальков, A. O. Злотников // Письма в Журн. эксперим. и теор. физ. : Наука, 2016. - Т. 104 Вып. 7-8. - С. 512-517

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович
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Val'kov, V. V.
Spin-polarized transport through Majorana bound states in a canted magnetic field / V. V. Val'kov, S. V. Aksenov // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. O4.1. - P. 221. - References: 3. - This study was supported by the Comprehensive programme SB RAS no.0358-2015-0007, the Russian Foundation for Basic Research, projects nos. 15-42- . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
semiconducting wire -- Majorana fermions -- topological superconductivity

Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Вальков, Валерий Владимирович; 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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    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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    Val'kov, V. V.
    Electronic spin polarization in the Majorana bound state in one-dimensional wires / V. V. Val'kov, S. V. Aksenov // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 112-115, DOI 10.1016/j.jmmm.2016.10.155. - Cited References: 22. - This work was financially supported by the Comprehensive programme SB RAS no. 0358-2015-0007, and the RFBR, projects nos. 15-42-04372, 16-02-00073, 16-42-242036 and partly by Government of Krasnoyarsk Region. . - ISSN 0304-8853
   Перевод заглавия: Электронная спиновая поляризация в майорановском связанном состоянии в одномерных проволоках

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
NON-ABELIAN STATISTICS
FERMIONS
Кл.слова (ненормированные):
Majorana bound state -- Topological superconductivity -- Spin polarization
Аннотация: We have studied the effect of magnetic field and disorder on the electronic z-spin polarization at the ends of the one-dimensional wire with strong Rashba spin-orbit coupling deposited on an s-wave superconductor. It was shown that in the topologically nontrivial phase the polarization as well as the energy of the Majorana bound state oscillate as a function of the magnetic field. Despite being substantially nonzero in the low transversal and longitudinal fields the polarization at one of the wire's ends is significantly suppressed at a certain range of the magnitudes and angles of the canted magnetic field. Thus, in this case the polarization cannot be regarded as a local order parameter. However, the sum of the absolute values of the polarization at both ends remains significantly nonzero. It was demonstrated that Anderson disorder doesn't seriously affect observed properties but leads to the appearance of the additional areas with weak spin polarization at the high magnetic fields.

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Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Вальков, Валерий Владимирович; 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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Val'kov, V. V.
Effect of the three-center terms on the chiral superconducting d-wave pairing of the Hubbard fermions on the triangular lattice / V. V. Val'kov, T. A. Val'kova, V. A. Mitskan // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 129-132, DOI 10.1016/j.jmmm.2016.12.085. - Cited References: 14. - The reported study was funded by the Russian Foundation for Basic Research, project no. 16-02-00073 and by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project no. 16-42-240435. . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
MODEL
Кл.слова (ненормированные):
Superconductivity -- Chiral order parametr -- Triangular lattice
Аннотация: Using the diagram technique for the Hubbard operators an integral equation that determines the order parameter of the superconducting phase Δ(p) was obtained in the framework of t−J−V and t−J*−V models on triangular lattice. It is shown that there are two scenarios of formation of superconducting phase with gapless spectrum at the critical concentration of carriers xc. The effect of three-center terms on implementation of this phase was also considered.

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Доп.точки доступа:
Val'kova, T. A.; Mitskan, V. A.; Мицкан, Виталий Александрович; Вальков, Валерий Владимирович; 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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Val'kov, V. V.
Energy structure of high-temperature superconductors with the intersite Coulomb interaction / V. V. Val'kov, M. M. Korovushkin // Eur. Phys. J. B. - 2009. - Vol. 69, Is. 2. - P. 219-227, DOI 10.1140/epjb/e2009-00141-4. - Cited References: 26. - This study was supported by the program "Quantum physics of condensed matter"of the Presidium of the Russian Academy of Sciences (RAS); the Russian Foundation for Basic Research (project no. 07-02-00226); the Siberian Branch of RAS (Interdisciplinary Integration project no. 53). One of authors (M. K.) would like to acknowledge the support of the Dynasty Foundation. . - ISSN 1434-6028

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TC SUPERCONDUCTIVITY
   SINGLE-BAND
   ELECTRON CORRELATIONS
   CU OXIDES
   J MODEL
   DERIVATION
Кл.слова (ненормированные):
Strongly correlated electron systems; heavy fermions -- Narrow-band systems; intermediate-valence solids -- Cuprate superconductors -- Strongly correlated electron systems heavy fermions -- Narrow-band systems intermediate-valence solids -- Cuprate superconductors -- Emery model -- Energy structures -- Fermi state -- Integrated density -- Root mean squares -- Spectral intensity -- Copper compounds -- Corundum -- Coulomb interactions -- Electrons -- Fermions -- High temperature superconductors -- Oxide superconductors -- Superconductivity
Аннотация: The effect of the intersite Coulomb interaction of fermions on the ground state and energy structure of high-temperature superconductors is considered within the three-band Emery model using an extended basis of the irreducible operators orthogonal on Mori. The proposed theory allows prediction of bands of the fluctuation states whose spectral intensity grows with an increase in the root-mean-square fluctuations of the occupation numbers. The increase in these fluctuations in high-temperature superconductors upon doping plays a key role in redistribution of the integrated density of the Fermi states.

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Держатели документа:
[Val'kov, V. V.
Korovushkin, M. M.] RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Вальков, Валерий Владимирович; Russian Academy of Sciences; Russian Foundation for Basic Research [07-02-00226]; RAS; Dynasty Foundation
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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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Val'kov, V. V.
Effect of interstitial Coulomb interaction on the occurrence of a gapless superconducting phase of Hubbard fermions on a triangular lattice / V. V. Val’kov, T. A. Val’kova, V. A. Mitskan // Bull. Russ. Acad. Sci. Phys. - 2016. - Vol. 80, Is. 6. - P. 612-615, DOI 10.3103/S1062873816060393. - Cited References: 10 . - ISSN 1062-8738
Кл.слова (ненормированные):
Physics -- Concentration dependence -- Coordination sphere -- Hubbard -- Nodal points -- Quantum transitions -- Superconducting order parameters -- Superconducting phase -- Triangular lattice -- Coulomb interactions
Аннотация: The concentration dependence of the position of nodal points of a superconducting order parameter is investigated using the t–J–V model for a triangular lattice with regard to the exchange and Coulomb interactions in two coordination spheres. The conditions for a topological quantum transition are established. © 2016, Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Влияние межузельного кулоновского взаимодействия на реализацию бесщелевой сверхпроводящей фазы фермионов хаббарда на треугольной решетке [Текст] / В. В. Вальков, Т. А. Валькова, В. А. Мицкан // Изв. РАН. Сер. физич. - 2016. - Т. 80 № 6. - С. 679-682

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Val’kova, T. A.; Валькова, Татьяна Александровна; Mitskan, V. A.; Мицкан, Виталий Александрович; Вальков, Валерий Владимирович
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Val'kov, V. V.
The influence of spin and charge fluctuations on the coexistence phase of superconductivity and antiferromagnetism in heavy-fermion Ce-based compounds / V. V. Val'kov, A. O. Zlotnikov // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. O2.3. - P. 136. - References: 2. - This study was funded by the Program of SB RAS 0358-2015-0002 and RFBR project No. 16-02-00073-a. A.O.Z. is grateful for support of the Grant of the President of the Russian Federation SP-1370.2015.5. . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
heavy fermions -- antiferromagnetism -- superconductivity -- Ginzburg-Landau theory

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович; 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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10.

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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