Berry phase effect on the exciton transport and on the exciton Bose-Einstein condensate.
With the exciton lifetime much extended in semiconductor quantum-well structures, the exciton transport and Bose-Einstein condensation have become a focus of research in recent years. We reveal a momentum-space gauge field in the exciton center-of-mass dynamics due to Berry phase effects. We predict a spin-dependent transport of the excitons analogous to the anomalous Hall and Nernst effects for electrons. We also predict spin-dependent circulation of a trapped exciton gas and instability in an exciton condensate in favor of vortex formation.
Yao
Wang
W
Department of Physics, The University of Texas, Austin, Texas 78712, USA. wangyao@physics.utexas.edu
Niu
Qian
Q