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Analytical solutions of topological surface states in a series of lattice models
Masaru Onoda
We derive the analytical solutions of surface states in a series of lattice models for three-dimensional topological insulators and their nontopological counterparts based on an an…
Temperature dependent magnetotransport around = 1/2 in ZnO heterostructures
Denis Maryenko, Joseph Falson, Yusuke Kozuka +4
The sequence of prominent fractional quantum Hall states up to =5/11 around =1/2 in a high mobility two-dimensional electron system confined at oxide heterointerface (ZnO) is…
Photonic analog of graphene model and its extension -- Dirac cone, symmetry, and edge states --
Tetsuyuki Ochiai, Masaru Onoda
This paper presents a theoretical analysis on bulk and edge states in honeycomb lattice photonic crystals with and without time-reversal and/or space-inversion symmetries. Multiple…
Tuning phase transition between quantum spin Hall and ordinary insulating phases
Shuichi Murakami, Satoshi Iso, Yshai Avishai +2
An effective theory is constructed for analyzing a generic phase transition between the quantum spin Hall and the insulator phases. Occurrence of degeneracies due to closing of the…
Left-handed Ferromagnet
Masaru Onoda, Andrei S. Mishchenko, Naoto Nagaosa
The dynamics of the total magnetization in metallic ferromagnet is studied theoretically taking into account the relativistic spin-orbit interaction. It is found that its quantum d…
Localization in a quantum spin Hall system
Masaru Onoda, Yshai Avishai, Naoto Nagaosa
Localization problem of electronic states in a two-dimensional quantum spin Hall system (QSH - a symplectic model with a non-trivial topological structure) is studied by the transf…
Disorder effect on the localization/delocalization in incommensurate potential
Masaru Onoda, Naoto Nagaosa
The interplay between incommensurate (IC) and random potentials is studied in a two-dimensional symplectic model with the focus on localization/delocalization problem. With the IC…
Role of relaxation in spin Hall effect
Masaru Onoda, Naoto Nagaosa
The role of the relaxation due to the impurity scattering and/or the contacts to leads/electrodes are studied for the spin Hall effect (SHE). Relaxation is essential to attain the…
Spin current and accumulation generated by spin Hall insulator
Masaru Onoda, Naoto Nagaosa
Spin current and accumulation generated by the electric field in spin Hall insulator (SHI) are investigated theoretically in terms of the Keldysh formalism. In contrast to the quan…
Anomalous Hall Effect and Skyrmion Number in Real- and Momentum-space
Masaru Onoda, Gen Tatara, Naoto Nagaosa
We study the anomalous Hall effect (AHE) for the double exchange model with the exchange coupling being smaller than the bandwidth for the purpose of clarifying the f…
Quantized Anomalous Hall Effect in Two-Dimensional Ferromagnets - Quantum Hall Effect from Metal -
Masaru Onoda, Naoto Nagaosa
We study the effect of disorder on the anomalous Hall effect (AHE) in two-dimensional ferromagnets. The topological nature of AHE leads to the integer quantum Hall effect from a me…
Effective mass staircase and the Fermi liquid parameters for the fractional quantum Hall composite fermions
Masaru Onoda, Takahiro Mizusaki, Hideo Aoki
Effective mass of the composite fermion in the fractional quantum Hall system, which is of purely interaction originated, is shown, from a numerical study, to exhibit a curious non…
Excitation spectrum and effective mass of the even-fraction quantum Hall liquid
Masaru Onoda, Takahiro Mizusaki, Takaharu Otsuka +1
To probe the nature of the even-fraction quantum Hall system, we have investigated the low-lying excitation spectrum by means of exact diagonalization for finite systems. We have f…