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Anomalous Hall effect in paramagnetic two dimensional systems
Dimitrie Culcer, Allan MacDonald, Qian Niu
We investigate the possibility of observing the anomalous Hall effect (AHE) in two dimensional paramagnetic systems. We apply the semiclassical equations of motion to carriers in t…
Intrinsic self-rotation of BEC Bloch wave packets
Roberto B. Diener, Artem M. Dudarev, Ganesh Sundaram +1
The semiclassical theory of Bloch wave packet dynamics predicts a self-rotation angular momentum in asymmetric periodic potentials, which has never been observed. We show how this…
Bloch Waves and Bloch Bands of Bose-Einstein Condensates in Optical Lattices
Biao Wu, Roberto B. Diener, Qian Niu
Bloch waves and Bloch band of Bose-Einstein Condensates in optical lattices are studied. We provide further evidence for the loop structure in the Bloch band, and compute the criti…
Controlled Generation of Dark Solitons with Phase Imprinting
Biao Wu, Jie Liu, Qian Niu
The generation of dark solitons in Bose-Einstein condensates with phase imprinting is studied by mapping it into the classic problem of a damped driven pendulum. We provide simple…
Landau and Dynamical Instabilities of the Superflow of Bose-Einstein Condensates in Optical Lattices
Biao Wu, Qian Niu
The superfluidity of Bose-Einstein condensates in optical lattices are investigated. Apart from the usual Landau instability which occurs when a BEC flows faster than the speed of…
Wave-packet dynamics in slowly perturbed crystals: Gradient corrections and Berry-phase effects
Ganesh Sundaram, Qian Niu
We present a unified theory for wave-packet dynamics of electrons in crystals subject to perturbations varying slowly in space and time. We derive the wave-packet energy up to the…
Aharonov-Bohm and Aharonov-Casher Effects: Connections to Dynamics of Topological Singularities
P. Ao, Q. Niu
We analyze the physical processes involved in the Aharonov-Bohm (A-B) and the Aharonov-Casher (A-C) effects, showing that an incomplete A-B effect knowledge can lead a totally wron…
Quantized Vortices in Superfluids and Superconductors
D. J. Thouless, Ping Ao, Qian Niu +2
We give a general review of recent developments in the theory of vortices in superfluids and superconductors, discussing why the dynamics of vortices is important, and why some key…
Nonequilibrium Effects and Self Heating in Single Electron Coulomb Blockade Devices
Chiu Liu, Qian Niu
We present a comprehensive investigation of nonequilibrium effects and self heating in single electron transfer devices based primarily on the Coulomb blockade effect. During an el…
Electron Depletion Due to Bias of a T-Shaped Field-Effect Transistor
G. A. Georgakis, Qian Niu
A T-shaped field-effect transistor, made out of a pair of two-dimensional electron gases, is modeled and studied. A simple numerical model is developed to study the electron distri…
Implications of adiabatic phases for a vortex in a superconductor film
Ping Ao, Qian Niu, David J. Thouless
Based on ideas of off-diagonal long range order and two-fluid model, we demonstrate that adiabatic phases for a slow motion of a vortex in a superconductor film give rise naturally…