238 citations · 1.5k across the 62 of their papers we have counts for
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Surface and interface effects on a magnetic Chern insulator
Ryo Ozawa, Masafumi Udagawa, Yutaka Akagi +1
Effects of an open surface on a magnetic Chern insulator are investigated in comparison with those of an interface to a capping magnetic layer. In magnets, an open surface often pe…
Low-energy Majorana states in spin-liquid transitions in a three-dimensional Kitaev model
Joji Nasu, Masafumi Udagawa, Yukitoshi Motome
A three-dimensional Kitaev model on a hyperhoneycomb lattice is investigated numerically at finite temperature. The Kitaev model is one of the solvable quantum spin models, where t…
Spin-orbit Coupling and Multiple Phases in Spin-triplet Superconductor SrRuO
Youichi Yanase, Shuhei Takamatsu, Masafumi Udagawa
We study the spin-orbit coupling in spin-triplet Cooper pairs and clarify multiple superconducting (SC) phases in SrRuO. Based on the analysis of the three-orbital Hubbard…
Topology and Interactions in a Frustrated Slab: Tuning from Weyl Semimetals to C > 1 Fractional Chern Insulators
E. J. Bergholtz, Zhao Liu, M. Trescher +2
We show that, quite generically, a [111] slab of spin-orbit coupled pyrochlore lattice exhibits surface states whose constant energy curves take the shape of Fermi arcs, localized…
Correlations and entanglement in flat band models with variable Chern numbers
Masafumi Udagawa, Emil J. Bergholtz
We discuss a number of illuminating results for tight binding models supporting a band with variable Chern number, and illustrate them explicitly for a simple class of two-banded m…
Entanglement Spectrum in Cluster Dynamical Mean-Field Theory
Masafumi Udagawa, Yukitoshi Motome
We study the entanglement spectrum of the Hubbard model at half filling on a kagome lattice. The entanglement spectrum is defined by the set of eigenvalues of reduced thermal densi…