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A: Fachverband Atomphysik

A 12: Ultracold atoms, ions, and BEC III (joint session A/Q)

A 12.7: Vortrag

Dienstag, 10. März 2020, 15:45–16:00, f303

Continuous phase transitions in spinor Bose-Einstein condensates with spin-orbital angular momentum coupling — •Yuxiong Duan^1,2, Yuriy Bidasyuk¹, and Andrey Surzhykov^1,2 — ¹Physikalisch–Technische Bundesanstalt, D–38116 Braunschweig, Germany — ²Technische Universität Braunschweig, D–38106 Braunschweig, Germany

Spin-orbital angular momentum (S-OAM) coupling in Bose-Einstein condensates has been recently realized using Raman coupling with Laguerre-Gaussian beams. A rich phase diagram even at zero temperature is predicted as a result of interplay between spin-orbit coupling, collisional interactions and quantization of angular momentum. In present work we focus on some key features introduced to the phase portrait by quantized angular momentum as this is the main difference of our system from more thoroughly studied linear momentum spin-orbit coupling. We demonstrate how appearance of quantized vortices in the S-OAM coupled system significantly alters the mechanism of phase transitions. In particular we find that the transition between the stripe phase and polarized (or unpolarized) phase is a continuous phase transition. During this process, a vortex molecule appears and contracts towards its center. This unique behavior is absent in the case of linear momentum spin-orbit coupling.