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Superconductivity with Wannier-Stark flat bands

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Title
Superconductivity with Wannier-Stark flat bands
Author(s)
Chan, Si Min; Alexei Andreanov; Sergej Flach; Batrouni, G. George
Publication Date
2024-02
Journal
Physical Review B, v.109, no.7
Publisher
AMER PHYSICAL SOC
Abstract
We investigate superconducting transport in the DC field induced Wannier-Stark flat bands in the presence of interactions. Flat bands offer the possibility of unconventional high temperature superconductivity, where the superfluid weight, Ds, is enhanced by the density overlap of the localized states. However, construction of flat bands typically requires very precise tuning of Hamiltonian parameters. To overcome this difficulty, we propose a feasible alternative to realize flat bands by applying a DC field in a commensurate lattice direction. We systematically characterize the superconducting behavior on these flat bands by studying the effect of the DC field and attractive Hubbard interaction strengths on the wave function, correlation length, pairing order parameter, and the superfluid weight Ds. Our main result is that the superfluid weight is dramatically enhanced at an optimal value of the interaction strength and weak DC fields. © 2024 American Physical Society.
URI
https://pr.ibs.re.kr/handle/8788114/15057
DOI
10.1103/PhysRevB.109.075153
ISSN
2469-9950
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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