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

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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