Superconductivity in monolayer FeSe enhanced by quantum geometry
Superconductivity in monolayer FeSe enhanced by quantum geometry
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DOI：
10.1103/physrevresearch.4.023232
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发表时间：
2021-08
影响因子：
4.2
通讯作者：
Taisei Kitamura;Tatsuya Yamashita;J. Ishizuka;A. Daido;Y. Yanase
中科院分区：
文献类型：
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作者：
Taisei Kitamura;Tatsuya Yamashita;J. Ishizuka;A. Daido;Y. Yanase
基于Bloch电子的几何性质，我们用依赖于k的库珀对势来表示非常规超导体中的超流重量。我们将该公式应用于单层FeSe的第一性原理计算得到的模型。我们的数值计算点的Berezinskiii-Kosterlitz无相变温度的显着提高，由于几何贡献的超流重量，这是不包括在费米液体理论。差距函数的k依赖性也稳定了超导态。我们的研究结果表明，布洛赫电子的几何性质在超导材料中起着至关重要的作用，并从量子几何的角度澄清超导性的隐藏方面铺平了道路。
We formulate the superfluid weight in unconventional superconductors with k-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 k-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.