Emergence of a Spin Microemulsion in Spin-Orbit Coupled Bose-Einstein Condensates

McGarrigle, Ethan C.; Delaney, Kris T.; Balents, Leon; Fredrickson, Glenn H.

doi:10.1103/PhysRevLett.131.173403

Emergence of a Spin Microemulsion in Spin-Orbit Coupled Bose-Einstein Condensates

Journal Article · Thu Oct 26 04:00:00 EDT 2023 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.131.173403· OSTI ID:2998604

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University of California, Santa Barbara, CA (United States)
University of California, Santa Barbara, CA (United States); Canadian Institute for Advanced Research, Toronto, ON (Canada)

We report the first numerical prediction of a “spin microemulsion”—a phase with undulating spin domains resembling classical bicontinuous oil-water-surfactant emulsions—in two-dimensional systems of spinor Bose-Einstein condensates with isotropic Rashba spin-orbit coupling. Using field-theoretic numerical simulations, we investigated the melting of a low-temperature stripe phase with supersolid character and find that the stripes lose their superfluidity at elevated temperature and undergo a Kosterlitz-Thouless-like transition into a spin microemulsion. Momentum distribution calculations highlight a thermally broadened occupation of the Rashba circle of low-energy states with macroscopic and isotropic occupation around the ring. Here, we provide a finite-temperature phase diagram that positions the emulsion as an intermediate, structured isotropic phase with residual quantum character before transitioning at higher temperature into a structureless normal fluid.

View Accepted Manuscript (DOE)

Research Organization:: University of California, Santa Barbara, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-08ER46524

OSTI ID:: 2998604

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 131; ISSN 1079-7114; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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