Finite-Momentum Dimer Bound State in Spin-Orbit Coupled Fermi Gas

Abstract

We investigate the two-body properties of a spin-1/2 Fermi gas subject to a spin-orbit coupling induced by laser fields. When an attractive s-wave interaction between unlike spins is present, the system may form a dimer bound state. Surprisingly, in the presence of a Zeeman field along the direction of the spin-orbit coupling, the bound state obtains finite center-of-mass mechanical momentum, whereas under the same condition but in the absence of the two-body interaction, the system has zero total momentum. This unusual result can be regarded as a consequence of the broken Galilean invariance by the spin-orbit coupling. Such a finite-momentum bound state will have profound effects on the many-body properties of the system.

arXiv comment3 figures, 6 pages, published version

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Cited by in corpus (48)

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• Topological Superfluids with Finite Momentum Pairing and Majorana Fermions
• The Raman dressed spin-1 spin-orbit coupled quantum gas
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• Inhomogeneous Fulde-Ferrell superfluidity in spin-orbit coupled atomic Fermi gases
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• Exotic pairing states in a Fermi gas with three-dimensional spin-orbit coupling
• Spin-orbit coupling induced Fulde-Ferrell-Larkin-Ovchinnikov-like Cooper pairing and skyrmion-like polarization textures in trapped optical lattices
• Flow enhanced pairing and other novel effects in Fermi gases in synthetic gauge fields
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• Fulde-Ferrell Superfluids without Spin Imbalance in Driven Optical Lattices
• Unconventional Fulde-Ferrell-Larkin-Ovchinnikov pairing states in a Fermi gas with spin-orbit coupling
• Bloch oscillations of spin-orbit-coupled cold atoms in an optical lattice and spin current generation
• Spin-orbital-angular-momentum-coupled quantum gases
• Beliaev Damping in Spin-$\frac{1}{2}$ Interacting Bosons with Spin-Orbit Coupling
• Superfluid density and Berezinskii-Kosterlitz-Thouless transition of a spin-orbit coupled Fulde-Ferrell superfluid
• Three-dimensional spin-orbit coupled Fermi gases: Fulde-Ferrell pairing, Majorana fermions, Weyl fermions and gapless topological superfluidity
• Spin-orbit-coupled topological Fulde-Ferrell states of fermions in a harmonic trap
• Center of Mass Momentum Dependent Interaction Between Ultracold Atoms
• Center-of-mass-momentum-dependent interaction between ultracold atoms
• Fulde-Ferrell-Larkin-Ovchinnikov state in spin-orbit-coupled superconductors
• Tuning Feshbach resonance in cold atomic gases with inter-channel coupling
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• BCS-BEC crossover and quantum phase transition in an ultracold Fermi gas under spin-orbit coupling
• Molecular state in a spin-orbital-angular-momentum coupled Fermi gas
• Three-boson spectrum in the presence of 1D spin-orbit coupling: Efimov's generalized radial scaling law
• Larkin-Ovchinikov superfluidity in time-reversal symmetric bilayer Fermi gases
• Evidence for correlated states in a cluster of bosons with Rashba spin-orbit coupling
• Spin-orbit-induced bound state and molecular signature of the degenerate Fermi gas in a narrow Feshbach resonance
• Non-Galilean response of Rashba coupled Fermi gases
• Energetics and structural properties of two- and three-boson systems in the presence of 1D spin-orbit coupling
• Triplet character of 2D-fermion dimers arising from $s$-wave attraction via spin-orbit coupling and Zeeman splitting
• Induced p-wave Superfluidity in Imbalanced Fermi Gases in a Synthetic Gauge Field