127th CEMS Colloquium

Title

Exotic and topological superconductivity generated from quantum geometry

Abstract

While the dispersion relation in the band structure is a fundamental property of electron systems in solids, the quantum geometry in the band structure is also essential for quantum materials [1]. In particular, the real part of the quantum geometric tensor, namely the Fubini-Study quantum metric, has recently attracted attention, while the imaginary part is well known as the Berry curvature. 

 I will discuss our recent studies on exotic superconductivity and topological superconductivity by utilizing the quantum geometry in superconductors. Spin-triplet superconductivity and ferromagnetism induced by quantum geometry [2], topological superconductivity arising from quantum geometric pair potentials [3], and utilization of nonlinear optical responses for detecting topological superconductivity [4] are discussed. Quantum geometric enhancement of high-Tc superconductivity in monolayer FeSe is also discussed [5].

[1] Päivi Törmä, Phys. Rev. Lett. 131, 240001 (2023).
[2] T. Kitamura, A. Daido, Y. Yanase, Phys. Rev. Lett. 132, 036001 (2024).
[3] A. Daido, T. Kitamura, Y. Yanase, Phys. Rev. B 110, 094505 (2024).
[4] H. Tanaka, H. Watanabe, Y. Yanase, Phys. Rev. B 110, 014520 (2024).
[5] T. Kitamura, T. Yamashita, J. Ishizuka, A. Daido, Y. Yanase, Phys. Rev. Res. 4, 023232 (2022).

Contact

email: k-akiyama@riken.jp
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