Superconductivity in monolayer FeSe enhanced by quantum geometry
Abstract
We formulate the superfluid weight in unconventional superconductors with -dependent Cooper pair potentials based on the geometric properties of Bloch electrons. We apply the formula to a model of the monolayer FeSe obtained by the first-principles calculation. Our numerical calculations point to a significant enhancement of the Berezinskii-Kosterlitz-Thouless transition temperature due to the geometric contribution to the superfluid weight, which is not included in the Fermi liquid theory. The -dependence of the gap function also stabilizes the superconducting state. Our results reveal that the geometric properties of Bloch electrons play an essential role in superconducting materials and pave the way for clarifying hidden aspects of superconductivity from the viewpoint of quantum geometry.
Cite
@article{arxiv.2108.10002,
title = {Superconductivity in monolayer FeSe enhanced by quantum geometry},
author = {Taisei Kitamura and Tatsuya Yamashita and Jun Ishizuka and Akito Daido and Youichi Yanase},
journal= {arXiv preprint arXiv:2108.10002},
year = {2021}
}
Comments
17 pages (Main text: 6 pages; Supplemental Materials: 11 pages), 6 figures (Main text: 4 figures; Supplemental Materials: 2 figures)