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arXiv · 1303.2628

Non-Galilean response of Rashba coupled Fermi gases

Daniel Maldonado-Mundo·Lianyi He·Patrik Ohberg·Manuel Valiente
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Abstract

We consider the effect of a momentum kick on the ground state of a non-interacting two-dimensional Fermi gas subject to Rashba spin-orbit coupling. Although the total momentum is a constant of motion, the gas does not obey the rules of Galilean relativity. Upon imprinting a small overall velocity to the non-interacting gas, we find that the Fermi sea is deformed in a non-trivial way. We also consider a weakly repulsive Fermi gas, and find, from its Hartree shift, that the total ground state of the system may change into a deformed, finite momentum ground state as the repulsion is increased beyond a critical value, without the need of any external Zeeman fields. We also discuss possible experimental signatures of these effects.

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Daniel Maldonado-Mundo, Lianyi He, Patrik Ohberg, Manuel Valiente. 2013-11-15. Non-Galilean response of Rashba coupled Fermi gases. https://doi.org/10.1103/physreva.88.053609

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