Thursday, March 15, 2012

1203.2795 (Zhou Li et al.)

Impact of Dresselhaus vs. Rashba spin-orbit coupling on the Holstein
polaron
   [PDF]

Zhou Li, L. Covaci, F. Marsiglio
We utilize an exact variational numerical procedure to calculate the ground state properties of a polaron in the presence of Rashba and linear Dresselhaus spin-orbit coupling. We find that when the linear Dresselhaus spin-orbit coupling approaches the Rashba spin-orbit coupling, the Van-Hove singularity in the density of states will be shifted away from the bottom of the band and finally disappear when the two spin-orbit couplings are tuned to be equal. The effective mass will be suppressed; the trend will become more significant for low phonon frequency. The presence of two dominant spin-orbit couplings will make it possible to tune the effective mass with more varied observables.
View original: http://arxiv.org/abs/1203.2795

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