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Spin–orbit coupling in the presence of strong atomic correlations

Usui, Ayaka; Fogarty, Thomás; Campbell, Steve; Gardiner, Simon A; Busch, Thomas

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Ayaka Usui

Thomás Fogarty

Steve Campbell

Thomas Busch


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 ground state 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.


Usui, A., Fogarty, T., Campbell, S., Gardiner, S. A., & Busch, T. (2020). Spin–orbit coupling in the presence of strong atomic correlations. New Journal of Physics, 22(1), Article 013050.

Journal Article Type Article
Acceptance Date Dec 24, 2019
Online Publication Date Jan 23, 2020
Publication Date Jan 31, 2020
Deposit Date Feb 19, 2020
Publicly Available Date Feb 19, 2020
Journal New Journal of Physics
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 22
Issue 1
Article Number 013050


Published Journal Article (1.4 Mb)

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Copyright Statement
Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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