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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.17: Poster

Thursday, March 21, 2013, 16:00–18:30, Empore Lichthof

Single-branch theory of ultracold Fermi gases with artificial Rashba spin-orbit coupling — Daniel Maldonado-Mundo, •Manuel Valiente, and Patrik Ohberg — SUPA, IPaQs, Heriot-Watt University, Edinburgh, UK

We consider interacting ultracold fermions subject to 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.