Topological Flat Bands in 2D lattices and 3D materials

量子物理学・ナノサイエンス第77回特別セミナー

概要

Electrons whose energy dispersion is bound within a narrow window, i.e. "flat bands", are conjectured to exhibit a wide-range of interesting physics phenomena. Take the twisted bilayer graphene as a representative example, the flatness of the electronic bands plays a crucial role in the physics of, for example in the appearance of both the correlated insulator states and of the strong-coupling superconductivity. In this talk, I report on our recent progress in the topological flat bands. I will highlight two main results: (1) Topological flat bands with fragile band topology in 2D Line-and Split graph lattice, (2) Topological flat bands with strong band topology in 2D Line- and Split graph lattice of bipartite lattice, and (3) Catalogue of Flat Band of 3D materials.

References 　　　　
• [1]　D. S. Ma, Y. Xu, C. S. Chiu, N. Regnault, A. A. Houck, Z. Song, and B. A. Bernevig, Physical Review Letters 125, 266403 (2020).
• [2]　C. S. Chiu, D. S. Ma, Z. D. Song, B. A. Bernevig, and A. A. Houck, Physical Review Research 2, 043414 (2020).
• [3]　N. Regnault, Y. Xu, M.R. Li, D. S. Ma, M. Jovanovic, A. Yazdani, S. S. P. Parkin, C. Felser, L. M. Schoop, N. Phuan Ong, R. J. Cava, L. Elcoro, Z.D. Song, B. A. Bernevig, arXiv:2106.05287

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ご来聴を歓迎いたします。

• 量子物理学・ナノサイエンス第77回特別セミナー

• 量子物理学・ナノサイエンス先端研究センター 主催
• 東京工業大学理学院・物理学系 共催