Non-Galilean response of Rashba-coupled Fermi gases

Daniel Maldonado-Mundo, Lianyi He, Patrik Ohberg, Manuel Valiente Cifuentes

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
66 Downloads (Pure)

Abstract

We consider the effect of a momentum kick on the ground state of a noninteracting 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 noninteracting gas, we find that the Fermi sea is deformed in a nontrivial 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 for any external Zeeman fields. We also discuss possible experimental signatures of these effects. © 2013 American Physical Society.

Original languageEnglish
Article number053609
Number of pages5
JournalPhysical Review A
Volume88
Issue number5
DOIs
Publication statusPublished - 8 Nov 2013

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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