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Phase diagram of a population-imbalanced attractive Fermi gas in the 1D-3D crossover regime

Satyan Bhongale, Leslie O. Baksmaty, Lei Jiang +1 more

Bulletin of the American Physical SocietyMar 22, 20110 citations

Probing the FFLO phase of a spin imbalanced 1D Fermi gas

Ann Sophie C. Rittner, Yean-an Liao, Tobias Paprotta +2 more

Bulletin of the American Physical SocietyMay 23, 20090 citations

Spin-Imbalance in a One-Dimensional Fermi Gas

Randall G. Hulet

Bulletin of the American Physical SocietyMar 18, 20100 citations

Spin–orbit coupling adjusting topological superfluid of mass-imbalanced Fermi gas

Jian Feng, Weiwei Zhang, Liang-Wei Lin +4 more

Topological superfluid state is different from the normal superfluid one due to the excitation energy gap on the boundary. How to obtain the topological superfluid state by using spin–orbit coupling to control the s-waves paired mass-imbalanced Fermi gas is a recent novel topic. In this paper, we study the topological superfluid phase diagram of two-dimensional mass-imbalanced Fermi gas with Rashba spin–orbit coupling at zero temperature. We find that due to the competition among mass imbalance, pairing interaction and spin–orbit coupling, there is a double-well structure in the thermodynamic potential, which affects the properties of the ground state of the system. We comprehensively give the phase diagrams of the system on the plane of spin–orbit coupling and chemical potential, and the phase diagrams on the plane of the reduced mass ratio and two-body binding energy. This study not only points out the stable region of topological superfluid state of mass-imbalanced Fermi gas, but also provides a detailed theoretical basis for better observation of topological superfluid state in experiments.Topological superfluid state is different from the normal superfluid one due to the excitation energy gap on the boundary. How to obtain the topological superfluid state by using spin–orbit coupling to control the s-waves paired mass-imbalanced Fermi gas is a recent novel topic. In this paper, we study the topological superfluid phase diagram of two-dimensional mass-imbalanced Fermi gas with Rashba spin–orbit coupling at zero temperature. We find that due to the competition among mass imbalance, pairing interaction and spin–orbit coupling, there is a double-well structure in the thermodynamic potential, which affects the properties of the ground state of the system. We comprehensively give the phase diagrams of the system on the plane of spin–orbit coupling and chemical potential, and the phase diagrams on the plane of the reduced mass ratio and two-body binding energy. This study not only points out the stable region of topological superfluid state of mass-imbalanced Fermi gas, but also provides a detailed theoretical basis for better observation of topological superfluid state in experiments.

Chinese Physics BApr 20, 20220 citations

Spin-imbalance in a one-dimensional Fermi gas

Yean-an Liao, Ann Sophie C. Rittner, Tobias Paprotta +5 more

arXiv:0912.0092NatureSep 1, 2010530 citations

Phase Separation and Pair Condensation in a Spin-Imbalanced 2D Fermi Gas

Debayan Mitra, Peter T. Brown, Peter Schauß +2 more

We study a two-component quasi-two-dimensional Fermi gas with imbalanced spin populations. We probe the gas at different interaction strengths and polarizations by measuring the density of each spin component in the trap and the pair momentum distribution after time of flight. For a wide range of experimental parameters, we observe in-trap phase separation characterized by the appearance of a spin-balanced core surrounded by a polarized gas. Our momentum space measurements indicate pair condensation in the imbalanced gas even for large polarizations where phase separation vanishes, pointing to the presence of a polarized pair condensate. Our observation of zero momentum pair condensates in 2D spin-imbalanced gases opens the way to explorations of more exotic superfluid phases that occupy a large part of the phase diagram in lower dimensions.We study a two-component quasi-two-dimensional Fermi gas with imbalanced spin populations. We probe the gas at different interaction strengths and polarizations by measuring the density of each spin component in the trap and the pair momentum distribution after time of flight. For a wide range of experimental parameters, we observe in-trap phase separation characterized by the appearance of a spin-balanced core surrounded by a polarized gas. Our momentum space measurements indicate pair condensation in the imbalanced gas even for large polarizations where phase separation vanishes, pointing to the presence of a polarized pair condensate. Our observation of zero momentum pair condensates in 2D spin-imbalanced gases opens the way to explorations of more exotic superfluid phases that occupy a large part of the phase diagram in lower dimensions.

arXiv:1604.01479Physical Review LettersAug 24, 201647 citations

Phase Diagram of A One Dimensional Spin-Imbalanced Fermi Gas

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