102 citations · 1.4k across the 61 of their papers we have counts for
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Deformation of localized states and state transitions in systems of randomly hopping interacting fermions
Takahiro Orito, Yoshihito Kuno, Ikuo Ichinose
We numerically study the random-hopping fermions (the Cruetz ladder) with repulsion and investigate how the interactions deform localized eigenstates by means of the one particle-d…
Localization and slow-thermalization in a cluster spin model
Yoshihito Kuno, Takahiro Orito, Ikuo Ichinose
Novel cluster spin model with interactions and disorder is introduced and studied. In specific type of interactions, we find an extensive number of local integrals of motion (LIOMs…
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…
Topological pump and bulk-edge-correspondence in an extended Bose-Hubbard model
Yoshihito Kuno, Yasuhiro Hatsugai
An extended Bose-Hubbard model (EBHM) with three- and four-body constraints can be feasible in cold atoms in an optical lattice. A rich phase structure including various symmetry-p…
Interplay and competition between disorder and flat band in an interacting Creutz ladder
Takahiro Orito, Yoshihito Kuno, Ikuo Ichinose
We clarify the interplay and competition between disorder and flat band in the Creutz ladder with inter-particle interactions focusing on the system's dynamics. Without disorder, t…
Bulk-edge Correspondence in the Adiabatic Heuristic Principle
Koji Kudo, Yoshihito Kuno, Yasuhiro Hatsugai
Using the Laughlin's argument on a torus with two pin-holes, we numerically demonstrate that the discontinuities of the center-of-mass work well as an invariant of the pumping phen…
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, 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…
Flat-band full localization and symmetry-protected topological phase on bilayer lattice systems
Ikuo Ichinose, Takahiro Orito, Yoshihito Kuno
In this work, we present bilayer flat-band Hamiltonians, in which all bulk states are localized and specified by extensive local integrals of motion (LIOMs). The present systems ar…
Plateau transitions of spin pump and bulk-edge correspondence
Yoshihito Kuno, Yasuhiro Hatsugai
Sequential plateau transitions of quantum spin chains (=1,3/2,2 and 3) are demonstrated by a spin pump using dimerization and staggered magnetic field as synthetic dimensions. T…