Browsing by Author "Kuan, WH"

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Energy levels of a parabolically confined quantum dot in the presence of spin-orbit interaction
(2004-06-01)
Kuan, WH
;
Tang, CS
;
Xu, W
;
電子物理學系
;
Department of Electrophysics
We present a theoretical study of the energy levels in a parabolically confined quantum dot in the presence of the Rashba spin-orbit interaction (SOI). The features of some low-lying states in various strengths of the SOI are examined at zero and nonzero magnetic fields. It is shown that the spin-polarized electronic states can be more easily achieved in a weakly confined dot when SOI is greater than a critical value of the confinement strength. The presence of a magnetic field enhances the possibility of the spin polarization and the SOI leads to different energy dependence on magnetic fields applied. Furthermore, in high magnetic fields, the spectra of low-lying states show basic features of Fock-Darwin levels as well as Landau levels. (C) 2004 American Institute of Physics.
The phase of a bose-einstein condensate by the interference of matter waves
(2005-10-01)
Kuan, WH
;
Jiang, TF
;
物理研究所
;
Institute of Physics
We present a calculation which produces the additional phase of a matter wave by applying an adiabatically changing optical field to a double-well Bose-Einstein condensate. An examination of the additional quantum phase is proposed through the comparison of the free expansion interference patterns of the perturbed double-well condensate and the pure double-well condensate.