101 citations · 309 across the 16 of their papers we have counts for
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Phase diagram of the Kitaev-Heisenberg model using various finite-size clusters
Masahiro Kadosawa, Masaaki Nakamura, Yukinori Ohta +1
We estimate phase boundaries of four ordered and two spin-liquid phases for the spin- Kitaev-Heisenberg (KH) model using four kinds of relatively-small clusters, based…
Study of Staggered Magnetization in the Spin- Square-Lattice Heisenberg Model Using Spiral Boundary Conditions
Masahiro Kadosawa, Masaaki Nakamura, Yukinori Ohta +1
We propose an efficient numerical method to obtain local order parameter in two-dimensional systems using spiral boundary conditions. As a benchmark, we first estimate the magnitud…
Electronic polarization in non-Bloch band theory
Shohei Masuda, Masaaki Nakamura
Hermitian topological materials are characterized by the nontrivial relation between topological numbers and edge modes, i.e. the bulk-boundary correspondence. In non-Hermitian sys…
One-dimensional projection of two-dimensional systems using spiral boundary conditions
Masahiro Kadosawa, Masaaki Nakamura, Yukinori Ohta +1
We introduce spiral boundary conditions (SBCs) as a useful tool for handling the shape of finite-size periodic clusters. Using SBCs, a lattice model for more than two dimensions ca…
Relationship between the Electronic Polarization and the Winding Number in Non-Hermitian Systems
Shohei Masuda, Masaaki Nakamura
We discuss an extension of the Resta's electronic polarization to non-Hermitian systems with periodic boundary conditions. We introduce the ``electronic polarization'' as an expect…
Characterization of topological insulators based on the electronic polarization with spiral boundary conditions
Masaaki Nakamura, Shohei Masuda, Satoshi Nishimoto
We introduce the electronic polarization originally defined in one-dimensional lattice systems to characterize two-dimensional topological insulators. The main idea is to use spira…