Single-branch theory of ultracold Fermi gases with artificial Rashba spin–orbit coupling

Daniel Maldonado-Mundo*, Patrik Ohberg, Manuel Valiente Cifuentes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We consider interacting ultracold fermions subject to the Rashba spin-orbit coupling. We construct a single-branch interacting theory for the Fermi gas when the system is dilute enough so that the positive helicity branch is not occupied at all in the non-interacting ground state. We show that the theory is renormalizable in perturbation theory and therefore yields a model of polarized fermions that avoids a multi-channel treatment of the problem. Our results open the path towards a much more straightforward approach to the many-body physics of cold atoms subject to artificial vector potentials.

Original languageEnglish
Article number134002
Number of pages5
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Issue number13
Publication statusPublished - 14 Jul 2013




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