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1.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Val'kov V. V., Korovushkin M. M.
Заглавие
: Lower subband splitting and superconductivity of 2D Hubbard fermions with strong intersite correlations
Коллективы
: International Symposium "Nanophysics and Nanoelectronics-2011" (March 2011; Nizhni Novgorod)
Место публикации
: Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2012. - Vol. 76, Is. 2. - P.133-135. - ISSN 1062-8738,
DOI
10.3103/S1062873812020074
Примечания
: Cited References: 6. - This study was supported by Quantum Physics of Condensed Matter program of the Presidium of the Russian Academy of Sciences; the Russian Foundation for Basic Research, project np. 10-02-00251; the federal target program Scientists and Science Teachers of an Innovate Russia, 2009-2013; the Siberian Branch of the Russian Academy of Sciences, complex integration project no. 53; RF Presidential Grant MK-1300.2011.2; and the Siberian Branch of the Russian Academy of Sciences' Lavrent'ev Competition for Young Scientists.
Ключевые слова
(''Своб.индексиров.''):
coulomb
correlations--doping levels--electron structures--fermi state--hubbard--intersite correlation--mean-square fluctuations--spectral intensity--split-off band--subbands--natural sciences
Аннотация:
The effect of the strong intersite
Coulomb
correlations on the formation of an electron structure in the Shubin-Vonsowsky model in the regime of strong one-site correlations is studied. The results reveal a split-off band of the Fermi states. The spectral intensity of this band grows with the enhancement of the doping level and is determined by the mean-square fluctuation of occupation numbers. This changes the structure of the electron density of states qualitatively. © 2012 Allerton Press, Inc.
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2.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kagan M.Yu., Mitskan V. A., Korovushkin M. M.
Заглавие
: Effect of the long-range
Coulomb
interaction on the phase diagram of the Kohn–Luttinger superconducting state in Idealized graphene
Место публикации
: J. Low Temp. Phys.: Springer/Plenum Publishers, 2015. - Vol. - P.1-7. - ISSN 0022,
DOI
10.1007/s10909-015-1427-2. - ISSN 15737357(eISSN)
Ключевые слова
(''Своб.индексиров.''): unconventional superconductivity--kohn-luttinger mechanism--graphene monolayer
Аннотация:
The effect of the long-range
Coulomb
interaction on the formation of the Kohn–Luttinger superconductivity in monolayer doped graphene is studied disregarding the Van der Waals potential of the substrate and both magnetic and non-magnetic impurities. It is shown that the allowance for the Kohn–Luttinger renormalizations up to the second order in perturbation theory in the on-site Hubbard interaction inclusively, as well as in the intersite
Coulomb
interaction, significantly affects the interplay between the superconducting phases with the f-wave, p+ip-wave, and d+id-wave symmetries of the order parameter. It is demonstrated that taking
Coulomb
repulsion of electrons located at the next-nearest neighboring atoms in such a system into account changes qualitatively the phase diagram and enhances the critical temperature of the transition to the superconducting phase.
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3.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Val'kov V. V., Dzebisashvili D. M., Korovushkin M. M., Barabanov A. F.
Заглавие
: Stability of the superconducting dx2-y2 phase in high-Tc superconductors with respect to the intersite
coulomb
repulsion of holes at oxygen
Коллективы
: Russian Foundation for Basic Research [16-02-00073, 16-02-00304]; Dynasty Foundation; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [SP-1361.2015.1]
Место публикации
: JETP Letters. - 2016. - Vol. 103, Is. 6. - P.385-389. - ISSN 0021-3640,
DOI
10.1134/S0021364016060114. - ISSN 1090-6487(eISSN)
Примечания
: Cited References:28. - This work was supported by the Russian Foundation for Basic Research, project nos. 16-02-00073 and 16-02-00304. The work of D.D.M. and M.M.K. was supported by the Dynasty Foundation and the work of M.M.K. was also supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. SP-1361.2015.1).
Предметные рубрики:
Hubbard-model
Spin polaron
Density
Аннотация:
It has been shown that, because of the two-orbital character of the subsystem of holes located at oxygen sites and the spatial separation of this subsystem from that of spins at copper ions, the superconducting phase in high-Tc superconductors is stable with respect to the strong
Coulomb
repulsion of holes located at nearestneighbor oxygen sites if the order parameter has the dx2−y2 symmetry. This effect is due to the symmetry characteristics of the
Coulomb
potential, owing to which the equation determining the Cooper pairing in the dx2−y2 channel does not include this potential.
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4.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kagan M. Y., Efremov D. V., Marienko M. S., Val'kov V. V.
Заглавие
: Triplet p-Wave Superconductivity in the Low-Density Extended Hubbard Model with
Coulomb
Repulsion
Разночтения заглавия
:авие SCOPUS: Triplet p-wave superconductivity in the low-density extended hubbard model with
Coulomb
repulsion
Место публикации
: JETP Letters. - 2011. - Vol. 93, Is. 12. - P.725-730. - ISSN 0021-3640,
DOI
10.1134/S0021364011120083
Примечания
: Cited References: 42. - We acknowledge useful with A. V. Chubukov, A.S. Alexandrov, I.A. Fomin, K.I. Kugel, and V. V. Kabanov for stimulating discussions. This work was supported by the Russian Foundation for Basic Research (project nos. 11-02-00708 and 11-02-00741). M.S.M acknowledges the support of the US Department of Energy (award no. DE-FG02-08ER64623, Hofstra University Center for Condensed Matter).
Предметные рубрики:
T-J MODEL
FERMI GAS
SUPERFLUID TRANSITION
PHASE-SEPARATION
SYSTEMS
TEMPERATURES
BEHAVIOR
LIQUID
POINT
STATE
Аннотация:
We analyze superconducting instabilities in 3D and 2D extended Hubbard model with
Coulomb
repulsion between electrons on neighboring sites in the limit of low electron density (n(el) - 0) on simple cubic (square) lattice. We show that in a realistic strong-coupling case U V W (U and V are the onsite and the intersite
Coulomb
repulsions, respectively, and W the bandwidth) the main SC instability corresponds to the p-wave pairing and in the leading order is correctly described by the equations obtained earlier in the absence of the intersite
Coulomb
interaction V = 0.
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5.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Val'kov V. V., Korovushkin M. M.
Заглавие
: Renormalization of Energy Structure and Oscillation Period in the de Haas-van Alphen Effect at the Strong Intersite
Coulomb
Interaction
Разночтения заглавия
:авие SCOPUS: Renormalization of energy structure and oscillation period in the de Haas-van Alphen effect at the strong intersite
Coulomb
interaction
Место публикации
: J. Phys. Soc. Jpn.: PHYSICAL SOC JAPAN, 2011. - Vol. 80, Is. 1. - Ст.14703. - С. P. - ISSN 0031-9015,
DOI
10.1143/JPSJ.80.014703
Примечания
: Cited References: 36. - 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. 10-02-00251), the Federal goal-oriented program Scientific Brainpower of the Russian Innovations 2009-2013, and the Siberian Division of RAS (Interdisciplinary Integration project No. 53). One of the authors (M. K.) would like to acknowledge the support of the Lavrentiev's Competition of the Siberian Division of RAS. The authors are grateful to the Physical Society of Japan for financial support in publication.
Предметные рубрики:
T-C SUPERCONDUCTOR
EXTENDED HUBBARD-MODEL
CUPRATE SUPERCONDUCTORS
ELECTRON CORRELATIONS
QUANTUM OSCILLATIONS
FERMI-SURFACE
OXIDES
TEMPERATURE
STATE
BANDS
Ключевые слова
(''Своб.индексиров.''): strongly correlated electron systems--cuprate superconductors--intersite
coulomb
interaction--t-v model--de haas-van alphen effect--cuprate superconductors--de haas-van alphen effect--intersite
coulomb
interaction--strongly correlated electron systems--t-v model
Аннотация:
The effect of strong intersite
Coulomb
correlations on the formation of the electron structure of the t-V model has been studied. A qualitatively new result indicating the occurrence of a split-off band of Fermi states has been obtained. The spectral intensity of this band increases with an increase in doping level and is determined by the mean-square fluctuation of occupation numbers. This results in the transformation of the energy structure and the integrated density of states and in a further decrease in state occupation in the quasimomentum space near the Fermi level as compared with Hubbard renormalization. It has been shown that this effect leads to an increase in the area of the quasimomentum space part limited by the Fermi contour and is important for the analysis of the de Haas-van Alphen oscillations in cuprate superconductors.
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6.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Nikolaev S. V., Ovchinnikov S. G.
Заглавие
: Cluster perturbation theory in Hubbard model exactly taking into account the short-range magnetic order in 2 x 2 cluster
Коллективы
:
Разночтения заглавия
:авие SCOPUS: Cluster perturbation theory in Hubbard model exactly taking into account the short-range magnetic order in 2 × 2 cluster
Место публикации
: J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 111, Is. 4. - P635-644. - ISSN 1063-7761,
DOI
10.1134/S1063776110100146
Примечания
: Cited References: 23. - The authors thank V. V. Val'kov for fruitful discussions of this work. This research was supported financially by the Russian Foundation for Basic Research (project nos. 09-02-90723-mob_st and 09-02-00127) and by program no. 5.7 of the Presidium of the Russian Academy of Sciences and integration project no. 40 of the Siberian Branch and Ural Division of the Russian Academy of Sciences.
Предметные рубрики:
INFINITE DIMENSIONS
SYSTEMS
STATE
Ключевые слова
(''Своб.индексиров.''): antiferromagnetic orders--characteristic energy--cluster perturbation theories--
coulomb
repulsions--density of state--dynamic mean field theories--eigenvalue problem--exact diagonalization--excited levels--finite temperatures--half-filling--hubbard--metal insulator transition temperature--nearest neighbors--numerical solution--pseudo-gap--quasiparticle spectrum--shadow zone--short-range magnetic orders--temperature evolution--zero temperatures--antiferromagnetism--eigenvalues and eigenfunctions--fermi level--hubbard model--mean field theory--metal insulator boundaries--perturbation techniques--semiconductor insulator boundaries--statistical mechanics--metal insulator transition
Аннотация:
The cluster perturbation theory is presented in the 2D Hubbard model constructed using X operators in the Hubbard-I approximation. The short-range magnetic order is taken into account by dividing the entire lattice into individual 2 x 2 clusters and solving the eigenvalue problem in an individual cluster using exact diagonalization taking into account all excited levels. The case of half-filling taking into account jumps between nearest neighbors is considered. As a result of numerical solution, a shadow zone is discovered in the quasiparticle spectrum. It is also found that a gap in the density of states in the quasiparticle spectrum at zero temperature exists for indefinitely small values of
Coulomb
repulsion parameter U and increases with this parameter. It is found that the presence of this gap in the spectrum is due to the formation of a short-range antiferromagnetic order. An analysis of the temperature evolution of the density of states shows that the metal-insulator transition occurs continuously. The existence of two characteristic energy scales at finite temperatures is demonstrated, the larger scale is associated with the formation of a pseudogap in the vicinity of the Fermi level, and the smaller scale is associated with the metal-insulator transition temperature. A peak in the density of states at the Fermi level, which is predicted in the dynamic mean field theory in the vicinity of the metal-insulator transition, is not observed.
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7.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Aplesnin S. S., Ryabinkina L. I., Romanova O. B., Velikanov D. A., Balaev A. D., Balaev D. A., Yanushkevich K. I., Galyas A. I., Demidenko O. F., Bandurina O. N.
Заглавие
: Transport properties and ferromagnetism of Co(x)Mn(1-x)Ssulfides
Разночтения заглавия
:авие SCOPUS: Transport properties and ferromagnetism of Co x Mn 1 - X S sulfides
Место публикации
: J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 106, Is. 4. - P765-772. - ISSN 1063-7761,
DOI
10.1134/S1063776108040158
Примечания
: Cited References: 39
Предметные рубрики:
GIANT VOLUME MAGNETOSTRICTION
COLOSSAL MAGNETORESISTANCE
MAGNETIC SEMICONDUCTORS
ELECTRICAL-PROPERTIES
ROOM-TEMPERATURE
ALPHA-MNS
SPINTRONICS
TRANSITION
FEXMN1-XS
FIELDS
Ключевые слова
(''Своб.индексиров.''):
coulomb
interactions--current voltage characteristics--electromotive force--ferromagnetism--magnetic susceptibility--magnetization--thermoelectricity--transport properties--charge susceptibility--external magnetic fields--temperature intervals--thermoelectromotive force--cobalt compounds
Аннотация:
We have studied the resistivity and thermoelectromotive force (thermo emf) in a temperature range of T = 80-1000 K, the magnetic susceptibility and magnetization in a temperature range of T= 4.2-300 K at an external magnetic field of up to 70 kOe, and the structural characteristics of CoxMn1 - S-x sulfides (0
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8.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Gavriliuk A. G., Kharlamova S. A., Lyubutin I. S., Ovchinnikov S. G., Potseluyko A. M., Trojan I. A., Zabluda V. N.
Заглавие
: Optical transitions in GdFe3(BO3)(4) and FeBO3 under high pressures
Разночтения заглавия
:авие SCOPUS: Optical transitions in GdFe3(BO3)4 and FeBO3 under high pressures
Место публикации
: J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2005. - Vol. 17: 2nd International Symposium on Physics of Solids Under High Presure Using Nuclear Probes (JUL 22-25, 2004, Cologne, GERMANY), Is. 48. - P7599-7604. - ISSN 0953-8984,
DOI
10.1088/0953-8984/17/48/011
Примечания
: Cited References: 8
Предметные рубрики:
ELECTRONIC-STRUCTURE
Ключевые слова
(''Своб.индексиров.''): band structure--
coulomb
blockade--high pressure effects--iron compounds--magnetic moments--mathematical models--optical properties--relaxation processes--
coulomb
correlations--electron correlations--insulator-semiconductor transitions--optical transitions--gadolinium compounds
Аннотация:
The optical properties of GdFe3(BO3)(4) under high pressures have been investigated experimentally and theoretically, and the results are compared with the properties of FeBO3. A model of the GdFe3(BO3)(4) band structure is derived within the multielectron model taking into account the strong electron correlations. Crossover of the Fe3+ ion high-spin and low-spin states, collapse of the magnetic moment, the relaxation
Coulomb
correlations, and insulator-semiconductor transition are predicted. Optical transitions in GdFe3(BO3)(4) and FeBO3 under high pressures were discovered.
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9.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Korshunov M. M., Gavrichkov V. A., Ovchinnikov S. G., Nekrasov I. A., Pchelkina Z. V., Anisimov V. I.
Заглавие
: Hybrid LDA and generalized tight-binding method for electronic structure calculations of strongly correlated electron systems
Место публикации
: Phys. Rev. B: AMERICAN PHYSICAL SOC, 2005. - Vol. 72, Is. 16. - Ст.165104. - ISSN 1098-0121,
DOI
10.1103/PhysRevB.72.165104
Примечания
: Cited References: 82
Предметные рубрики:
T-J MODEL
DENSITY-FUNCTIONAL CALCULATION
NARROW ENERGY BANDS
MEAN-FIELD THEORY
COULOMB
INTERACTIONS
FERMION SYSTEMS
COPPER OXIDES
SUPERCONDUCTORS
LA2-XSRXCUO4
OXYGEN
Аннотация:
A hybrid scheme for the electronic structure calculations of strongly correlated electron systems is proposed. The ab initio local density approximation calculation is used to construct the Wannier functions and obtain single electron and
Coulomb
parameters of the multiband Hubbard-type model. In strong correlation regime the electronic structure within multiband Hubbard model is calculated by the generalized tight-binding method, which combines the exact diagonalization of the model Hamiltonian for a small cluster (unit cell) with perturbation treatment of the intercluster hopping and interactions. For undoped La2CuO4 and Nd2CuO4 this scheme results in charge transfer insulators with correct values of gaps and dispersions of bands in agreement with the angle-resolved photoemission data.
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10.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Bayukov O. A., Gavrilyuk A. M., Zabluda V. N., Lyubutin I. S., Ovchinnikov S. G., Potseluyko A. M., Tomas M., Trojan I. A., Kharlamova S. A.
Заглавие
: Studies of magnetic and optic properties of rare-earth gallo-ferroborates by Mossbauer and optical spectroscopy
Место публикации
: Physica B: ELSEVIER SCIENCE BV, 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P1321-1323. - ISSN 0921-4526,
DOI
10.1016/j.physb.2005.01.397
Примечания
: Cited References: 3
Ключевые слова
(''Своб.индексиров.''): strongly correlated electron system--antiferromagnets--borates--antiferromagnets--borates--strongly correlated electron system--antiferromagnetism--cryostats--energy gap--magnetic moments--magnetic properties--mossbauer spectroscopy--optical properties--single crystals--borates--
coulomb
correlations--liquid helium--strongly correlated electron systems--gadolinium compounds
Аннотация:
Magnetic and optical properties of GdFe3-xGax(BO3)(4) single crystals are investigated by Mossbauer and optical spectroscopy. The GdFe3(BO3)(4) multielectron band structure model is derived. A high- and low-spin crossover of Fe3+ ion, a collapse of the magnetic moment, the suppression of
Coulomb
correlations, and insulator-semiconductor transition are predicted. The jump of an energy gap is measured at pressure 43 GPa. (c) 2005 Elsevier B.V. All rights reserved.
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11.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Aplesnin S. S., Petrakovskii G. A., Ryabinkina L. I., Abramova G. M., Kiselev N. I., Romanova O. B.
Заглавие
: Influence of magnetic ordering on the resistivity anisotropy of alpha-MnS single crystal
Разночтения заглавия
:авие SCOPUS: Influence of magnetic ordering on the resistivity anisotropy of α-MnS single crystal; авие SCOPUS: Influence of magnetic ordering on the resistivity anisotropy of ?-MnS single crystal
Место публикации
: Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 2004. - Vol. 129, Is. 3. - P195-197. - ISSN 0038-1098,
DOI
10.1016/j.ssc.2003.09.028; Solid State Commun. - 2004. - Vol. 129, Is. 3. - P195-197. - Вариант Sopus
Примечания
: Cited References: 7
Ключевые слова
(''Своб.индексиров.''): anisotropy of resistivity--optical gap--d. anisotropy of resistivity--d. optical gap--antiferromagnetism--band structure--bandwidth--diffractometers--electron transitions--fermi level--hamiltonians--light absorption--magnetic anisotropy--magnetization--single crystals--spectroscopic analysis--x ray diffraction analysis--
coulomb
repulsion--resistivity anisotropy--semiconducting manganese compounds--d. anisotropy of resistivity--d. optical gap--antiferromagnetism--band structure--bandwidth--diffractometers--electron transitions--fermi level--hamiltonians--light absorption--magnetic anisotropy--magnetization--single crystals--spectroscopic analysis--x ray diffraction analysis--
coulomb
repulsion--resistivity anisotropy--semiconducting manganese compounds
Аннотация:
The resistivity and the optical absorbtion spectra of single crystal alpha-MnS are studied in the temperature range 80-300 K along two directions [100] and [111]. Strong anisotropy of the resistivity, and the shift of absorbtion spectra band edge below T 160 K are explained in terms of model involving delocalized holes in 3d-band manganese ions interacting with localized spins by using the sd-model. (C) 2003 Elsevier Ltd. All rights reserved.
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12.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Fransson J., Eriksson O., Sandalov I.
Заглавие
: Many-body approach to spin-dependent transport in quantum dot systems
Место публикации
: Phys. Rev. Lett.: AMERICAN PHYSICAL SOC, 2002. - Vol. 88, Is. 22. - Ст.226601. - ISSN 0031-9007,
DOI
10.1103/PhysRevLett.88.226601
Примечания
: Cited References: 37
Предметные рубрики:
SINGLE-ELECTRON TRANSISTOR
COULOMB
-BLOCKADE
ANDERSON IMPURITY
ROOM-TEMPERATURE
TUNNEL-JUNCTIONS
EVEN NUMBER
MODEL
MAGNETORESISTANCE
OSCILLATIONS
CONDUCTANCE
Аннотация:
By means of a diagram technique for Hubbard operators, we show the existence of a spin-dependent renormalization of the localized levels in an interacting region, e.g., quantum dot, modeled by the Anderson Hamiltonian with two conduction bands. It is shown that the renormalization of the levels with a given spin direction is due to kinematic interactions with the conduction subbands of the opposite spin. The consequence of this dressing of the localized levels is a drastically decreased tunneling current for ferromagnetically ordered leads compared to that of paramagnetically ordered leads. Furthermore, the studied system shows a spin-dependent resonant tunneling behavior for ferromagnetically ordered leads.
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13.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Sandalov I. S.
Заглавие
: Periodical anderson model and electron-phonon interaction
Коллективы
: International Conference on the Physics of Transition Metals
Место публикации
: Int. J. Mod. Phys. B. - 1993. - Vol. 7, Is. 1-3. - P.62-66. - ISSN 0217-9792,
DOI
10.1142/S0217979293000160
Примечания
: Cited References: 8
Предметные рубрики:
STRONGLY CORRELATED SYSTEMS
COULOMB
INTERACTION
LATTICE THEORY
Аннотация:
The periodical Anderson model (PAM) is microscopically derived. It is shown that the PAM is a mean field theory for the electric potential. The mixing interaction (MI) consists of single- and two- particle contributions. The first is proportional to the overlap integral of localized and band wave functions and vanishes when band energies are on the Fermi surface. It leads to the absence of heavy-fermion effects in the theories based on the PAM with only this mixing term. Using the orthogonal basis this term vanishes only at zero temperature. Applicability of the Luttinger theorem to systems with strongly-correlated electrons (SSCE) is discussed. The phonon dynamic matrix and electron-phonon interaction (EPI) for SSCE are microscopically derived.
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14.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Sandalov I. S., Filatjev V. I.
Заглавие
:
Coulomb
interaction and lattice theory of strongly correlated systems .1. mean field-equations for equilibrium positions of ions and band-structure
Место публикации
: Physica B. - 1990. - Vol. 162, Is. 2. - P.139-160. - ISSN 0921-4526,
DOI
10.1016/0921-4526(90)90046-W
Примечания
: Cited References: 31
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15.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Sandalov I. S., Filatjev V. I.
Заглавие
:
Coulomb
interaction and lattice theory of strongly correlated systems .2. dynamic matrix, electron-boson and effective electron-electron interactions
Место публикации
: Physica B. - 1990. - Vol. 162, Is. 2. - P.161-171. - ISSN 0921-4526,
DOI
10.1016/0921-4526(90)90047-X
Примечания
: Cited References: 13
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16.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Val'kov V. V., Korovushkin M. M.
Заглавие
: Energy structure of high-temperature superconductors with the intersite
Coulomb
interaction
Коллективы
: Russian Academy of Sciences; Russian Foundation for Basic Research [07-02-00226]; RAS; Dynasty Foundation
Место публикации
: Eur. Phys. J. B: SPRINGER, 2009. - Vol. 69, Is. 2. - P219-227. - ISSN 1434-6028,
DOI
10.1140/epjb/e2009-00141-4
Примечания
: 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.
Предметные рубрики:
HIGH-TC SUPERCONDUCTIVITY
SINGLE-BAND
ELECTRON CORRELATIONS
CU OXIDES
J MODEL
DERIVATION
Ключевые слова
(''Своб.индексиров.''): 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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17.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Val'kov V. V., Val’kova T. A., Mitskan V. A.
Заглавие
: Effect of interstitial
Coulomb
interaction on the occurrence of a gapless superconducting phase of Hubbard fermions on a triangular lattice
Место публикации
: Bull. Russ. Acad. Sci. Phys.: Allerton Press Incorporation, 2016. - Vol. 80, Is. 6. - P.612-615. - ISSN 10628738 (ISSN),
DOI
10.3103/S1062873816060393
Примечания
: Cited References: 10
Ключевые слова
(''Своб.индексиров.''): 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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18.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Val'kov V. V., Dzebisashvili D. M., Korovushkin M. M., Barabanov A. F.
Заглавие
: The reason for implementation of the d–wave rather than s–wave pairing in cuprate superconductors
Коллективы
: Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации
: VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.I2.2. - P.122. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания
: References: 6. - The work was supported by the RFBR, grant № 16-02-00073, 16-02-00304
Ключевые слова
(''Своб.индексиров.''): cuprate superconductors--spin-fermion model--
coulomb
repulsion
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19.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Val'kov V. V., Dzebisashvili D. M., Korovushkin M. M., Barabanov A. F.
Заглавие
: Stability of the d-wave pairing with respect to the intersite
Coulomb
repulsion in cuprate superconductors
Коллективы
: Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации
: J. Magn. Magn. Mater.: Elsevier Science, 2017. - Vol. 440. - P.123-126. - ISSN 0304-8853,
DOI
10.1016/j.jmmm.2016.12.090
Примечания
: Cited References: 23. - The work was supported by the Siberian Branch of Russian Academy of Sciences (project no. 0358-2015-0002, Complex Program II.2P), the Russian Foundation for Basic Research (RFBR) and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund (projects nos. 16-42-240435 and 16-42-243057). The work of A.F.B. was funded by RFBR (project no. 16-02-00304). The work of M.M.K. was supported by grant of the President of the Russian Federation (project MK-1398.2017.2).
Предметные рубрики:
HUBBARD-MODEL
EXCITATIONS
Ключевые слова
(''Своб.индексиров.''): cuprate superconductors--spin-fermion model--intersite
coulomb
repulsion
Аннотация:
Within the spin-fermion model for cuprate superconductors, the influence of the intersite
Coulomb
interactions V2 and V′2V′2 between holes located at the next-nearest-neighbor oxygen ions of CuO2 plane on the implementation of the dx2−y2dx2−y2-wave pairing is studied. It is shown that d-wave pairing can be suppressed only for unphysically large values of V2 and V′2V′2.В рамках спин-фермионной модели для купратных сверхпроводников изучено влияние межузельных кулоновских отталкиваний V2 и V2' между дырками, находящимися на следующих за ближайшими ионах кислорода CuO2-плоскости, на реализацию сверхпроводящего dx2y2-спаривания. Показано, что d-спаривание подавляется только при нефизически больших значениях параметров V2 и V2'.
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20.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kagan, M. Yu., Val'kov V. V., Aksenov S. V.
Заглавие
: Effects of anisotropy and
Coulomb
interactions on quantum transport in a quadruple quantum-dot structure
Место публикации
: Phys. Rev. B: American Physical Society, 2017. - Vol. 95, Is. 3. - Ст.035411. - ISSN 2469-9950,
DOI
10.1103/PhysRevB.95.035411. - ISSN 2469-9969(eISSN)
Примечания
: Cited References:62. - We acknowledge fruitful discussions with P. I. Arseyev, N. S. Maslova, V. N. Mantsevich, and R. Sh. Ikhsanov. This work was financially supported by the Comprehensive programme SB RAS No. 0358-2015-0007, the RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund, Projects No. 15-02-03082, No. 15-42-04372, No. 16-42-243056, and No. 16-42-242036. M. Yu. K. thanks the Program of Basic Research of the National Research University Higher School of Economics for support.
Предметные рубрики:
2-BAND HUBBARD-MODEL
ONE NARROW-BAND
ANOMALOUS RESISTIVITY
Аннотация:
We present an analytical and numerical investigation of the spectral and transport properties of a quadruple quantum-dot (QQD) structure which is one of the popular low-dimensional systems in the context of fundamental quantum physics study, future electronic applications, and quantum calculations. The density of states, occupation numbers, and conductance of the structure were analyzed using the nonequilibrium Green's functions in the tight-binding approach and the equation-of-motion method. In particular the anisotropy of hopping integrals and on-site electron energies as well as the effects of the finite intra- and interdot
Coulomb
interactions were investigated. It was found out that the anisotropy of the kinetic processes in the system leads to the Fano-Feshbach asymmetrical peak. We demonstrated that the conductance of the QQD device has a wide insulating band with steep edges separating triple-peak structures if the intradot
Coulomb
interactions are taken into account. The interdot
Coulomb
correlations between the central QDs result in the broadening of this band and the occurrence of an additional band with low conductance due to the Fano antiresonances. It was shown that in this case the conductance of the anisotropic QQD device can be dramatically changed by tuning the anisotropy of on-site electron energies.
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