432 citations · 2.7k across the 59 of their papers we have counts for
17 papers · 1 filter
Dynamical Tunneling Blockade in Layer-Pseudospin Ferromagnets
Lingxian Kong, Yuta Murakami, Ryuichi Shindou +1
Double-layer systems with narrow or flat electronic bands may exhibit spontaneous interlayer coherence, described by a layer-pseudospin ferromagnetic order parameter. In modern rea…
Universal hard-edge statistics of non-Hermitian random matrices
Zhenyu Xiao, Ryuichi Shindou, Kohei Kawabata
Random matrix theory is a powerful tool for understanding spectral correlations inherent in quantum chaotic systems. Despite diverse applications of non-Hermitian random matrix the…
Spin Space Groups: Full Classification and Applications
Zhenyu Xiao, Jianzhou Zhao, Yanqi Li +2
In this work, we exhaust all the spin-space symmetries, which fully characterize collinear, non-collinear, commensurate, and incommensurate spiral magnetism, and investigate enrich…
Singular-Value Statistics of Non-Hermitian Random Matrices and Open Quantum Systems
Kohei Kawabata, Zhenyu Xiao, Tomi Ohtsuki +1
The spectral statistics of non-Hermitian random matrices are of importance as a diagnostic tool for chaotic behavior in open quantum systems. Here, we investigate the statistical p…
Antiparticle of exciton in semimetals
Lingxian Kong, Ryuichi Shindou, Yeyang Zhang
An emergent quantized field enriches quantum many-body systems. We propose an antiparticle analog of the exciton in semimetals as an emergent collective mode in interacting electro…
Berry curvature for coupled waves of magnons and electromagnetic waves
Akihiro Okamoto, Ryuichi Shindou, Shuichi Murakami
In this paper, we introduce Berry curvature, topological Chern number and topological chiral edge mode, that emerge from a hybridization between magnon and electromagnetic wave in…
Helicoidal excitonic phase in an electron-hole double layer system
Ke Chen, Ryuichi Shindou
We propose helicoidal excitonic phase in a Coulomb-coupled two-dimensional electron-hole double layer (EHDL) system with relativistic spin-orbit interaction. Previously, it was dem…
Topological Boundary Modes from Translational Deformations
Yosuke Nakata, Yoshitaka Ito, Yasunobu Nakamura +1
Localized states universally appear when a periodic potential is perturbed by defects or terminated at its surface. In this Letter, we theoretically and experimentally demonstrate…
Unconventional scaling theory in disorder-driven quantum phase transition
Xunlong Luo, Tomi Ohtsuki, Ryuichi Shindou
We clarify novel forms of scaling functions of conductance, critical conductance distribution and localization length in a disorder-driven quantum phase transition between band ins…
Theory of metal-insulator transitions in graphite under high magnetic field
Zhiming Pan, Xiao-Tian Zhang, Ryuichi Shindou
Graphite under high magnetic field exhibits consecutive metal-insulator (MI) transitions as well as re-entrant insulator-metal (IM) transition in the quasi-quantum limit at low tem…
Chiral Topological Excitons in a Chern Band Insulator
Ke Chen, Ryuichi Shindou
A family of semiconductors called as Chern band insulator are shown to host exciton bands with non-zero topological Chern integers and chiral exciton edge modes. Using a prototypic…
Magnetostatic wave analog of integer quantum Hall state in patterned magnetic films
Ryuichi Shindou, Jun-ichiro Ohe
A magnetostatic spin wave analog of integer quantum Hall (IQH) state is proposed in realistic patterned ferromagnetic thin films. Due to magnetic shape anisotropy, magnetic moments…
Chiral spin-wave edge modes in dipolar magnetic thin films
Ryuichi Shindou, Jun-ichiro Ohe, Ryo Matsumoto +2
Based on a linearized Landau-Lifshitz equation, we show that two-dimensional periodic allay of ferromagnetic particles coupled with magnetic dipole-dipole interactions supports chi…
Topological chiral magnonic edge mode in a magnonic crystal
Ryuichi Shindou, Ryo Matsumoto, Shuichi Murakami +1
Topological phases have been explored in various fields in physics such as spintronics, photonics, liquid helium, correlated electron system and cold-atomic system. This leads to t…
Disordered topological quantum critical points in three-dimensional systems
Ryuichi Shindou, Ryota Nakai, Shuichi Murakami
Generic non-magnetic disorder effects onto those topological quantum critical points (TQCP), which intervene the three-dimensional topological insulator and an ordinary insulator,…
Noncommutative geometry and nonabelian Berry phase in the wave-packet dynamics of Bloch electrons
Ryuichi Shindou, Ken-Ichiro Imura
Motivated by a recent proposal on the possibility of observing a monopole in the band structure, and by an increasing interest on the role of Berry phase in spintronics, we studied…
Quantum Spin Pump in S=1/2 antiferromagnetic chains -Holonomy of phase operators in sine-Gordon theory-
Ryuichi Shindou
In this paper, we propose the quantum spin pumping in quantum spin systems where an applied electric field () and magnetic field () cause a finite spin gap to its critical gr…