Spin-orbit coupling in the presence of strong atomic correlations

Abstract

We explore the influence of contact interactions on a synthetically spin-orbit coupled system of two ultracold trapped atoms. Even though the system we consider is bosonic, we show that a regime exists in which the competition between the contact and spin-orbit interactions results in the emergence of a ground state that contains a significant contribution from the anti-symmetric spin state. This ground state is unique to few-particle systems and does not exist in the mean-field regime. The transition to this state is signalled by an inversion in the average momentum from being dominated by centre-of-mass momentum to relative momentum and also affects the global entanglement shared between the real- and pseudo-spin spaces. Indeed, competition between the interactions can also result in avoided crossings in the groundstate which further enhances these correlations. However, we find that correlations shared between the pseudo-spin states are strongly depressed due to the spin-orbit coupling and therefore the system does not contain spin-spin entanglement.

21 pages, 9 figures

References in corpus (8)

• Sudden Death of Entanglement
• Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
• Degenerate Quantum Gases with Spin-Orbit Coupling
• Dicke-type phase transition in a spin-orbit coupled Bose-Einstein condensate
• Quantum phase transition in the Dicke model with critical and non-critical entanglement
• Criticality revealed through quench dynamics the Lipkin-Meshkov-Glick model
• Energy spectrum of a harmonically trapped two-atom system with spin-orbit coupling
• Energy spectra of two interacting fermions with spin-orbit coupling in a harmonic trap

Cited by in corpus (3)

• Few-body Bose gases in low dimensions -- a laboratory for quantum dynamics
• Engineering impurity Bell states through coupling with a quantum bath
• Enhanced strong interaction effect in synthetic spin-orbit coupling with mixed spin symmetry