Center-of-mass-momentum-dependent interaction between ultracold atoms

Abstract

We show that a type of two-body interaction, which depends on the momentum of the center of mass (COM) of these two particles, can be realized in ultracold atom gases with a laser-modulated magnetic Feshbach resonance (MFR). Here the MFR is modulated by two laser beams propagating along different directions, which can induce Raman transition between two-body bound states. The Doppler effect causes the two-atom scattering length to be strongly dependent on the COM momentum of these two atoms. As a result, the effective two-atom interaction is COM-momentum dependent, while the one-atom free Hamiltonian is still the simple kinetic energy p^2/(2m).

arXiv commentThis was meant to be a replacement of arXiv:1608.04803

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• Realizing Fulde-Ferrell Superfluids via a Dark-State Control of Feshbach Resonances
• Universal Feature in Optical Control of a p-wave Feshbach Resonance
• Theory of strongly paired fermions with arbitrary short-range interactions
• High-momentum tail and universal relations of a Fermi gas near a Raman-dressed Feshbach resonance
• Probing Energy-Dependent Feshbach Resonances by Optical Control
• Tuning Feshbach resonance in cold atomic gases with inter-channel coupling
• Synthesis of Majorana mass terms in low-energy quantum systems