Berry Phase Effect on Exciton Transport and Bose Einstein Condensate

Details Berry Phase Effect on Exciton Transport and Bose Einstein Condensate Berry Phase Effect on Exciton Transport and Bose Einstein Condensate

2008-01-08

arxiv.org/abs/0801.1103v3

Phys. Rev. Lett. 101, 106401 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.106401

With exciton lifetime much extended in semiconductor quantum-well structures, their transport and Bose-Einstein condensation 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 spin-dependent topological 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.

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