116 citations · 352 across the 9 of their papers we have counts for
9 papers
Landau-Zener tunneling problem for Bloch states
Ryuji Takahashi, Naoyuki Sugimoto
We study the Landau-Zener tunneling problem for particles bound in periodic lattice insulators. To this end, we construct the path integral based on the Bloch and Wannier functions…
Current control of systems with a Peierls distortion by magnetic field
Ryuji Takahashi, Naoyuki Sugimoto
We study the tunneling phenomenon of a ladder system with a Peierls distortion in a magnetic flux, and the response of electrons the insulator is investigated when the tunneling cu…
Semiclassical Lattice effects on interband tunneling of a two-state system
Ryuji Takahashi, Naoyuki Sugimoto
Previously, we have shown that the transition probability of the Landau-Zener problem in periodic lattice systems becomes large by taking into account the nonlinearity of the energ…
Berry curvature in magnon-phonon hybrid systems
Ryuji Takahashi, Naoto Nagaosa
We theoretically study the Berry curvature of the magnon induced by the hybridization with the acoustic phonons via the spin-orbit and dipolar interactions. We first discuss the ma…
Interfacial Fermi Loops from Interfacial Symmetries
Ryuji Takahashi, Shuichi Murakami
We propose a concept of interfacial symmetries such as interfacial particle-hole symmetry and interfacial time-reversal symmetry, which appear in interfaces between two regions rel…
Completely flat bands and fully localized states on surfaces of anisotropic diamond-lattice models
Ryuji Takahashi, Shuichi Murakami
We discuss flat-band surface states on the (111) surface in the tight-binding model with nearest-neighbor hopping on the diamond lattice, in analogy to the flat-band edge states in…
Gapless interface states between topological insulators with opposite Dirac velocities
Ryuji Takahashi, Shuichi Murakami
The Dirac cone on a surface of a topological insulator shows linear dispersion analogous to optics and its velocity depends on materials. We consider a junction of two topological…
Thermoelectric transport of perfectly conducting channels in two- and three-dimensional topological insulators
Shuichi Murakami, Ryuji Takahashi, O. A. Tretiakov +2
Topological insulators have gapless edge/surface states with novel transport properties. Among these, there are two classes of perfectly conducting channels which are free from bac…
Thermoelectricity by Perfectly Conducting Channels in Quantum Spin Hall Systems
Ryuji Takahashi, Shuichi Murakami
Thermoelectric transport of two-dimensional quantum spin Hall systems are theoretically studied in narrow ribbon geometry. We find that at high temperature electrons in the bulk st…