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Chaos-driven dynamics in spin-orbit coupled atomic gases | | Jonas Larson
; Brandon Anderson
; Alexander Altland
; | | Date: |
Tue, 14 Aug 2012 17:00:10 GMT (1897kb,D) | | Abstract: | The dynamics, appearing after a quantum quench, of a trapped, spin-orbit
coupled, dilute atomic gas is studied. The characteristics of the evolution is
greatly influenced by the symmetries of the system, and we especially compare
evolution for an isotropic Rashba coupling and for an anisotropic spin-orbit
coupling. As we break the rotational symmetry by making the spin-orbit coupling
anisotropic, the underlying classical model is chaotic and the quantum dynamics
is affected accordingly. Within experimentally relevant time-scales and
parameters, the system thermalizes in a quantum sense. The corresponding
equilibration time is found to agree with the Ehrenfest time, i.e. we
numerically verify a ~log(1/h) scaling. Upon thermalization, we find the
equilibrated distributions show examples of quantum scars distinguished by
accumulation of atomic density for certain energies. At shorter time-scales we
discuss non-adiabatic effects deriving from the spin-orbit coupled induced
Dirac point. In the vicinity of the Dirac point, spin fluctuations are large
and, even at short times, a semi-classical analysis fails. | | Source: | arXiv, 1208.2923 | | Services: | Forum | Review | PDF | Favorites | |
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