121 citations · 1.2k across the 51 of their papers we have counts for
9 papers · 1 filter
Machine Learning Study on the Flat-Band States Constructed by Molecular-Orbital Representation with Randomness
Takumi Kuroda, Tomonari Mizoguchi, Hiromu Araki +1
We study the characteristic probability density distribution of random flat band models by machine learning. The models considered here are constructed on the basis of the molecula…
Competition of First-Order and Second-Order Topology on the Honeycomb Lattice
Matthew Bunney, Tomonari Mizoguchi, Yasuhiro Hatsugai +1
We investigate both first-order topology, as realized through Haldane's model, and second-order topology, implemented through an additional Kekulé-distortion, on the honeycomb latt…
Non-Hermitian topology in rock-paper-scissors games
Tsuneya Yoshida, Tomonari Mizoguchi, Yasuhiro Hatsugai
Non-Hermitian topology is a recent hot topic in condensed matters. In this paper, we propose a novel platform drawing interdisciplinary attention: rock-paper-scissors (RPS) cycles…
Construction of interacting flat-band models by molecular-orbital representation: Correlation functions, energy gap, and entanglement
Tomonari Mizoguchi, Yoshihito Kuno, Yasuhiro Hatsugai
We calculate correlation functions of exactly-solvable one-dimensional flat-band models by utilizing the "molecular-orbital" representation. The models considered in this paper hav…
Thermoelectric transport of type-I, II, and III massless Dirac fermions in two-dimensional lattice model
Tomonari Mizoguchi, Hiroyasu Matsuura, Masao Ogata
We study longitudinal electric and thermoelectric transport coefficients of Dirac fermions on a simple lattice model where tuning of a single parameter enables us to change the typ…
Multiple quantum scar states and emergent slow-thermalization in the flat-band system
Yoshihito Kuno, Tomonari Mizoguchi, Yasuhiro Hatsugai
Quantum many-body scars (QMBS) appear in a flat-band model with interactions on the saw-tooth lattice. The flat-band model includes a compact support localized eigenstates, called…
Square-root topological phase with time-reversal and particle-hole symmetry
Tsuneya Yoshida, Tomonari Mizoguchi, Yoshihito Kuno +1
Square-root topological phases have been discussed mainly for systems with chiral symmetry. In this paper, we analyze the topology of the squared Hamiltonian for systems preserving…
Flat-band solutions in -dimensional decorated diamond and pyrochlore lattices: Reduction to molecular problem
Tomonari Mizoguchi, Hosho Katsura, Isao Maruyama +1
Flat-band models have been of particular interest from both fundamental aspects and realization in materials. Beyond the canonical examples such as Lieb lattices and line graphs, a…
Flat band, spin-1 Dirac cone, and Hofstadter diagram in the fermionic square kagome model
Tomonari Mizoguchi, Yoshihito Kuno, Yasuhiro Hatsugai
We study characteristic band structures of the fermions on a square kagome lattice, one of the two-dimensional lattices hosting a corner-sharing network of triangles. We show that…