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Possible existence of a band of extended states induced by inter-Landau-band mixing in quantum Hall system
Gang Xiong, Shi-Dong Wang, Qian Niu +4
The mixing of states with {\it opposite chirality} in quantum Hall system is shown to have delocalization effect. It is possible that extended states may form bands because of this…
Transition to Instability in a Periodically Kicked Bose-Einstein Condensate on a Ring
Jie Liu, Chuanwei Zhang, Mark G. Raizen +1
A periodically kicked ring of a Bose-Einstein condensate is considered as a nonlinear generalization of the quantum kicked rotor, where the nonlinearity stems from the mean field i…
Berry Phase Effects on Dynamics of Quasiparticles in a Superfluid with a Vortex
Chuanwei Zhang, Artem M. Dudarev, Qian Niu
We study quasiparticle dynamics in a Bose-Einstein condensate with a vortex by following the center of mass motion of a Bogoliubov wavepacket, and find important Berry phase effect…
Charge Hall effect driven by spin-dependent chemical potential gradients and Onsager relations in mesoscopic systems
E. M. Hankiewicz, Jian Li, Tomas Jungwirth +3
We study theoretically the spin-Hall effect as well as its reciprocal phenomenon (a transverse charge current driven by a spin-dependent chemical potential gradient) in electron an…
Ab initio calculation of intrinsic spin Hall effect in semiconductors
G. Y. Guo, Yugui Yao, Qian Niu
Relativistic band theoretical calculations reveal that intrinsic spin Hall conductivity in hole-doped archetypical semiconductors Ge, GaAs and AlAs is large $[\sim 100 (\hbar/e)(Ωc…
Fidelity of a Bose-Einstein Condensate
Jie Liu, Wenge Wang, Chuanwei Zhang +2
We investigate fidelity, the Loschmidt echo, for a Bose-Einstein Condensate. It is found that the fidelity decays with time in various ways (exponential, Gaussian, and power-law),…