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Field-induced metal-insulator transition and switching phenomenon in correlated insulators
Naoyuki Sugimoto, Shigeki Onoda, Naoto Nagaosa
We study the nonequilibrium switching phenomenon associated with the metal-insulator transition under electric field E in correlated insulator by a gauge-covariant Keldysh formalis…
Quantum transport theory of anomalous electric, thermoelectric, and thermal Hall effects in ferromagnets
Shigeki Onoda, Naoyuki Sugimoto, Naoto Nagaosa
The mechanism of the anomalous Hall transport phenomena, if it is of the intrinsic or extrinsic origin, has been controversial. We present a unified theory of them for ferromagneti…
Electrically driven spin excitation in a ferroelectric magnet DyMnO_3
N. Kida, Y. Ikebe, Y. Takahashi +7
Temperature (5--250 K) and magnetic field (0--70 kOe) variations of the low-energy (1--10 meV) electrodynamics of spin excitations have been investigated for a complete set of ligh…
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…
Intrinsic spin Hall effect in platinum metal
G. Y. Guo, S. Murakami, T. -W. Chen +1
Spin Hall effect in metallic Pt is studied with first-principles relativistic band calculations. It is found that intrinsic spin Hall conductivity (SHC) is as large as $\sim 2000 (…
Two-Staged Magnetoresistance Driven by Ising-like Spin Sublattice in SrCo6O11
S. Ishiwata, I. Terasaki, F. Ishii +5
A two-staged, uniaxial magnetoresistive effect has been discovered in SrCo6O11 having a layered hexagonal structure. Conduction electrons and localized Ising spins are in different…
Chiral spin pairing in helical magnets
Shigeki Onoda, Naoto Nagaosa
The Ginzburg-Landau Hamiltonian for incommensurate frustrated classical spin systems is analyzed. The coupling to phonons through the Dzyaloshinskii-Moriya interaction and/or the f…
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…
Quantum charge pumping and electric polarization in Anderson insulators
Chyh-Hong Chern, Shigeki Onoda, Shuichi Murakami +1
We investigate adiabatic charge pumping in disordered system in one dimension with open and closed boundary conditions. In contrast to the Thouless charge pumping, the system has n…
Spin-polarization coupling in multiferroic transition-metal oxides
Chenglong Jia, Shigeki Onoda, Naoto Nagaosa +1
A systematic microscopic theory of magnetically induced ferroelectricity and lattice modulation is presented for all electron configurations of Mott-insulating transition-metal oxi…