Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 95: Cold Atomic Gases, Superfluids, Quantum Fluids and Solids
TT 95.1: Vortrag
Donnerstag, 15. März 2018, 15:00–15:15, HFT-FT 131
Vortex states in one- and two-band rotating Fermi gases in the BCS-BEC crossover — •Serghei Klimin1, Jacques Tempere1, and Milorad Milosevic2 — 1TQC, Universiteit Antwerpen, Antwerpen, Belgium — 2Departement Fysica, Universiteit Antwerpen, Antwerpen, Belgium
Atomic Fermi superfluids can be described in terms of an effective field theory [1] for a macroscopic wave function representing the field of condensed pairs, analogous to the Ginzburg-Landau theory for superconductors. Rotation can stabilize vortices in atomic gases similarly to the magnetic field in superconductors, leading to the appearance of an effective vector potential. On the basis of the effective field theory, equilibrium vortex state diagrams are derived. They are in good agreement with available results of the Bogoliubov - de Gennes theory and with experimental data. We report also the equilibrium vortex phase diagram of a rotating two-band Fermi gas. This study is particularly focused on novel features due to interband interactions which can be experimentally resolved. We reveal the non-monotonic resonant dependence of the free energy for a two-band superfluid as a function of temperature, which is directly manifested in vortex phase diagrams, where areas of stability for both integer and fractional vortex states are found. The present investigation embraces the BCS-BEC crossover regime and the entire temperature range below the critical temperature.
S. N. Klimin, J. Tempere, G. Lombardi, J. T. Devreese, EPJ B 88, 122 (2015)