31 citations · 75 across the 13 of their papers we have counts for
7 papers · 1 filter
Spin-Pumping-Induced Non-Linear Electric Current on the Surface of a Ferromagnetic Topological Insulator
Yusuke Hama, Kentaro Nomura
We investigate the spin-pumping-induced electric current on the surface of a three-dimensional topological insulator hybridized with a ferromagnet, namely, ferromagnetic topologica…
Electromagnon on the Surface of Magnetic Topological Insulator
Yusuke Hama, Naoto Nagaosa
We investigate theoretically the electromagnon on the surfaces of the magnetic topological insulator thin films. It is found that when the magnetic asymmetry between the top and bo…
Green's Function of Magnetic Topological Insulator in Gradient Expansion Approach
Yusuke Hama, Naoto Nagaosa
We study the Keldysh Green's function of the Weyl-fermion surface state of the three-dimensional topological insulator coupled with a space-time dependent magnetization in the grad…
Dicke Model for Quantum Hall Systems
Y. Hama, M. H. Fauzi, K. Nemoto +2
Quantum Hall (QH) systems consist of many-body electron and nuclear spins. They are coupled so weakly through the hyperfine interaction that normally electron spin dynamics are sca…
Nambu-Goldstone modes and the Josephson supercurrent in the bilayer quantum Hall system
Yusuke Hama, George Tsitsishvili, Zyun F. Ezawa
An interlayer phase coherence develops spontaneously in the bilayer quantum Hall system at the filling factor . On the other hand, the spin and pseudospin degrees of freedom a…
Spin Supercurrent in the Canted Antiferromagnetic Phase
Yusuke Hama, George Tsitsishvili, Zyun F. Ezawa
The spin and layer (pseudospin) degrees of freedom are entangled coherently in the canted antiferromagnetic phase of the bilayer quantum Hall system at the filling factor . Th…