Yusuke Hama

Spin supercurrent in the canted antiferromagnetic phase

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

Nambu–Goldstone modes and the Josephson supercurrent in the bilayer quantum Hall system

\ensuremath{\nu}=2

Goldstone Modes in Bilayer Quantum Hall Systems at ν = 2

. A complex Goldstone mode emerges describing such a combined degree of freedom. In the zero tunneling-interaction limit (

Higgs mechanism with type-II Nambu-Goldstone bosons at finite chemical potential

{\ensuremath{\Delta}}_{\text{SAS}}\ensuremath{\rightarrow}0

The study of Goldstone modes in ν = 2 bilayer quantum Hall systems

), its phase field provokes a supercurrent carrying both spin and charge within each layer. The Hall resistance is predicted to become anomalous precisely as in the

Negative-Temperature State Relaxation and Reservoir-Assisted Quantum Entanglement in Double Spin Domain Systems.

\ensuremath{\nu}=1

Negative-Temperature State Relaxation in Double Spin Domain Systems

bilayer system in the counterflow and drag experiments. Furthermore, it is shown that the total current flowing in the bilayer system is a supercurrent carrying solely spins in the counterflow geometry. It is intriguing that all these phenomena occur only in imbalanced bilayer systems.

Electromagnon on the surface of a magnetic topological insulator

An interlayer phase coherence develops spontaneously in the bilayer quantum Hall system at the filling factor

Relaxation to Negative Temperatures in Double Domain Systems

\nu =1

Dicke Model for Quantum Hall Systems

. On the other hand, the spin and pseudospin degrees of freedom are entangled coherently in the canted antiferromagnetic phase of the bilayer quantum Hall system at the filling factor