Effect of superconductivity on the shape of flat bands

Shaginyan, V. R.; Msezane, A. Z.; Amusia, M. Ya.; Japaridze, G. S.

doi:10.1209/0295-5075/ac64ba

Effect of superconductivity on the shape of flat bands

Journal Article · 01 April 2022 · Europhysics Letters

DOI:https://doi.org/10.1209/0295-5075/ac64ba· OSTI ID:1983047

; Msezane, A. Z.; Amusia, M. Ya.; Japaridze, G. S.

Abstract For the first time, basing both on experimental facts and our theoretical consideration, we show that Fermi systems with flat bands should be tuned with the superconducting state. Experimental measurements on magic-angle twisted bilayer graphene of the Fermi velocityV_Fas a function of the temperatureT_cof superconduction phase transition have revealed, whereN_s(0) is the density of states at the Fermi level. We show that the high-T_ccompoundsexhibit the same behavior. Such observation is a challenge to theories of high-T_csuperconductivity, sinceV_Fis negatively correlated withT_c, for. We show that the theoretical idea of forming flat bands in strongly correlated Fermi systems can explain this behavior and other experimental data collected on bothand twisted bilayer graphene. Our findings place stringent constraints on theories describing the nature of high-T_csuperconductivity and the deformation of flat band by the superconducting phase transition.

Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Basic Energy Sciences (BES)

Sponsoring Organization:: USDOE

OSTI ID:: 1983047

Journal Information:: Europhysics Letters, Vol. 138, Issue 1; ISSN 0295-5075

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

References (30)

Scaling behavior of heavy fermion metals Shaginyan, V. R.; Amusia, M. Ya.; Msezane, A. Z. Physics Reports, Vol. 492, Issue 2-3 https://doi.org/10.1016/j.physrep.2010.03.001	journal	July 2010
Quasiparticle dispersion and lineshape in a strongly correlated liquid with the fermion condensate Amusia, M. Ya; Shaginyan, V. R. Physics Letters A, Vol. 275, Issue 1-2 https://doi.org/10.1016/S0375-9601(00)00569-7	journal	October 2000
New approach in the microscopic Fermi systems theory Khodel, V. A.; Shaginyan, V. R.; Khodel, V. V. Physics Reports, Vol. 249, Issue 1-2 https://doi.org/10.1016/0370-1573(94)00059-X	journal	December 1994
Universal behavior of heavy-fermion metals near a quantum critical point Shaginyan, V. R. Journal of Experimental and Theoretical Physics Letters, Vol. 79, Issue 6 https://doi.org/10.1134/1.1759411	journal	March 2004
Universal Behavior of Two-DimensionalHe3at Low Temperatures Shaginyan, V. R.; Msezane, A. Z.; Popov, K. G. Physical Review Letters, Vol. 100, Issue 9 https://doi.org/10.1103/PhysRevLett.100.096406	journal	March 2008
Topological disorder triggered by interaction-induced flattening of electron spectra in solids Khodel, V. A.; Clark, J. W.; Zverev, M. V. Physical Review B, Vol. 102, Issue 20 https://doi.org/10.1103/PhysRevB.102.201108	journal	November 2020
Flat Bands and Salient Experimental Features Supportingthe Fermion Condensation Theory of Strongly Correlated Fermi Systems Shaginyan, V. R.; Amusia, M. Ya.; Msezane, A. Z. Physics of Atomic Nuclei, Vol. 83, Issue 2 https://doi.org/10.1134/S1063778820020271	journal	March 2020
Universal T/B Scaling Behavior of Heavy Fermion Compounds (Brief Review) Shaginyan, V. R.; Msezane, A. Z.; Clark, J. W. JETP Letters, Vol. 112, Issue 10 https://doi.org/10.1134/S0021364020220026	journal	November 2020
Unconventional superconductivity in magic-angle graphene superlattices Cao, Yuan; Fatemi, Valla; Fang, Shiang Nature, Vol. 556, Issue 7699 https://doi.org/10.1038/nature26160	journal	March 2018
Superconductors, orbital magnets and correlated states in magic-angle bilayer graphene Lu, Xiaobo; Stepanov, Petr; Yang, Wei Nature, Vol. 574, Issue 7780 https://doi.org/10.1038/s41586-019-1695-0	journal	October 2019
Strongly correlated Chern insulators in magic-angle twisted bilayer graphene Nuckolls, Kevin P.; Oh, Myungchul; Wong, Dillon Nature, Vol. 588, Issue 7839 https://doi.org/10.1038/s41586-020-3028-8	journal	December 2020
Correlation-driven topological phases in magic-angle twisted bilayer graphene Choi, Youngjoon; Kim, Hyunjin; Peng, Yang Nature, Vol. 589, Issue 7843 https://doi.org/10.1038/s41586-020-03159-7	journal	January 2021
Graphene bilayers with a twist Andrei, Eva Y.; MacDonald, Allan H. Nature Materials, Vol. 19, Issue 12 https://doi.org/10.1038/s41563-020-00840-0	journal	November 2020
High-temperature surface superconductivity in topological flat-band systems Kopnin, N. B.; Heikkilä, T. T.; Volovik, G. E. Physical Review B, Vol. 83, Issue 22 https://doi.org/10.1103/PhysRevB.83.220503	journal	June 2011
Superfluid weight and Berezinskii-Kosterlitz-Thouless transition temperature of twisted bilayer graphene Julku, A.; Peltonen, T. J.; Liang, L. Physical Review B, Vol. 101, Issue 6 https://doi.org/10.1103/PhysRevB.101.060505	journal	February 2020
Special Issue on the Fundamental Problems of High-Temperature Superconductivity Sadovskii, Michael; Pudalov, Vladimir Journal of Superconductivity and Novel Magnetism, Vol. 29, Issue 4 https://doi.org/10.1007/s10948-016-3426-1	journal	February 2016
Microscopic electronic inhomogeneity in the high-Tc superconductor Bi2Sr2CaCu2O8+x Pan, S. H.; O'Neal, J. P.; Badzey, R. L. Nature, Vol. 413, Issue 6853 https://doi.org/10.1038/35095012	journal	September 2001
Theory of Superconductivity Bardeen, J.; Cooper, L. N.; Schrieffer, J. R. Physical Review, Vol. 108, Issue 5 https://doi.org/10.1103/PhysRev.108.1175	journal	December 1957
Tunnelling from a Many-Particle Point of View Bardeen, J. Physical Review Letters, Vol. 6, Issue 2 https://doi.org/10.1103/PhysRevLett.6.57	journal	January 1961
On a new method in the theory of superconductivity Bogoljubov, N. N. Il Nuovo Cimento, Vol. 7, Issue 6 https://doi.org/10.1007/BF02745585	journal	March 1958
Quasiparticles and quantum phase transition in universal low-temperature properties of heavy-fermion metals Shaginyan, V. R.; Msezane, A. Z.; Stephanovich, V. A. Europhysics Letters (EPL), Vol. 76, Issue 5 https://doi.org/10.1209/epl/i2006-10346-7	journal	December 2006
Density functional theory of fermion condensation Shaginyan, V. R. Physics Letters A, Vol. 249, Issue 3 https://doi.org/10.1016/S0375-9601(98)00736-1	journal	November 1998
Dissymmetrical tunneling in heavy-fermion metals Shaginyan, V. R. Journal of Experimental and Theoretical Physics Letters, Vol. 81, Issue 5 https://doi.org/10.1134/1.1921320	journal	March 2005
Asymmetric tunneling, Andreev reflection and dynamic conductance spectra in strongly correlated metals Shaginyan, V. R.; Popov, K. G. Physics Letters A, Vol. 361, Issue 4-5 https://doi.org/10.1016/j.physleta.2006.09.058	journal	February 2007
Flat bands and strongly correlated Fermi systems Shaginyan, V. R.; Msezane, A. Z.; Stephanovich, V. A. Physica Scripta, Vol. 94, Issue 6 https://doi.org/10.1088/1402-4896/ab10b4	journal	April 2019
Evolution of the Kondo lattice and non-Fermi liquid excitations in a heavy-fermion metal Seiro, S.; Jiao, L.; Kirchner, S. Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-05801-5	journal	August 2018
Independent superconductors and correlated insulators in twisted bilayer graphene Saito, Yu; Ge, Jingyuan; Watanabe, Kenji Nature Physics, Vol. 16, Issue 9 https://doi.org/10.1038/s41567-020-0928-3	journal	June 2020
Tuning superconductivity in twisted bilayer graphene Yankowitz, Matthew; Chen, Shaowen; Polshyn, Hryhoriy Science, Vol. 363, Issue 6431 https://doi.org/10.1126/science.aav1910	journal	January 2019
Untying the insulating and superconducting orders in magic-angle graphene Stepanov, Petr; Das, Ipsita; Lu, Xiaobo Nature, Vol. 583, Issue 7816 https://doi.org/10.1038/s41586-020-2459-6	journal	July 2020
Emergent Critical Charge Fluctuations at the Kondo Breakdown of Heavy Fermions Komijani, Yashar; Coleman, Piers Physical Review Letters, Vol. 122, Issue 21 https://doi.org/10.1103/PhysRevLett.122.217001	journal	May 2019

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