143 citations · 283 across the 6 of their papers we have counts for
6 papers
Vortex Dynamics in Superfluid Systems: Cyclotron Type Motion
E. Demircan, P. Ao, Q. Niu
Vortex dynamics in superfluids is investigated in the framework of the nonlinear Schrödinger equation. The natural motion of the vortex is of cyclotron type, whose frequency is fou…
Transverse force on a quantized vortex in a superfluid
D. J. Thouless, P. Ao, Q. Niu
We have derived an exact expression for the total nondissipative transverse force acting on a quantized vortex moving in a uniform background. The derivation is valid for neutral b…
Interactions of Collective Excitations with Vortices in Superfluid Systems
E. Demircan, P. Ao, Q. Niu
We investigate the interactions of collective excitations with vortices in superfluid systems, including He and superconductors. The dynamical equations are obtained by the ai…
Double-tip STM for Surface Analysis
Q. Niu, M. C. Chang, C. K. Shih
We explore the possibility of using a double-tip STM to probe the single electron Green function of a sample surface, and describe a few important applications: (1) Probing constan…
From Feynman's Wave Function to the Effective Theory of Vortex Dynamics
Q. Niu, P. Ao, D. J. Thouless
We calculate the overlap between two many-body wave functions for a superfluid film containing a vortex at shifted positions. Comparing the results to phenomenological theories, wh…
Dynamic Fractional Stark Ladders in DC--AC Fields
X. -G. Zhao, R. Jahnke, Q. Niu
A single band in a spatially periodic system splits into a series of quasienergy subbands under the action of DC--AC electric fields. These dynamic fractional Stark ladders should…