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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster: Quantum Optics and Photonics II

Q 27.8: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Excitations of a Bose--Einstein condensate with angular spin--orbit coupling — •Ivana Vasić and Antun Balaž — Scientific Computing Laboratory, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia

A theoretical model of a Bose--Einstein condensate with angular spin--orbit coupling has been recently introduced and it has been established that a half--skyrmion configuration represents the ground state in a certain regime of spin--orbit coupling and interaction. We investigate low--lying excitations of this phase by using the method of Bogoliubov and simulations of the time--dependent Gross--Pitaevskii equation. We find that a sudden shift of the trap bottom results in a complex motion of the center--of--mass of the system in the x--y plane that is markedly different from a response of a competing phase. This behaviour of the half-skyrmion phase comprises a low--frequency interaction--dependent oscillation as well as a high--frequency contribution. Moreover, the breathing mode frequency of the half--skyrmion is set by the spin-orbit coupling and interaction strength, while it takes a universal value in the competing state.