3 papers
cond-mat.mes-hall2024
Hidden chiral symmetry for kagome lattice and its analogs
Tomonari Mizoguchi, Yasuhiro Hatsugai
Chiral symmetry plays an essential role in condensed matter physics. In tight-binding models, it is often attributed to bipartite lattice structures, and its typical consequence is…
physics.optics2024
Band structures of generalized eigenvalue equation and conic section
Takuma Isobe, Tsuneya Yoshida, Yasuhiro Hatsugai
Band structures of several metamaterials are described by generalized eigenvalue equations where complex bands emerge even if the involved matrices are Hermitian. In this paper, we…
cond-mat.mes-hall2019
Molecular-orbital representation of generic flat-band models
Tomonari Mizoguchi, Yasuhiro Hatsugai
We develop a framework to describe a wide class of flat-band models, with and without a translational symmetry, by using "molecular orbitals" introduced in the prior work (HATSUGAI…