Interacting spin-orbit- coupled spin-1 Bose-Einstein condensates

Year: 2016

Authors: Sun K., Qu CL., Xu Y., Zhang YP., Zhang CW.

Autors Affiliation: ‎Univ Texas Dallas, Dept Phys, Richardson, TX 75080 USA;‎ Univ Trento, INO CNR BEC, I-38123 Povo, Italy;‎ Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; OIST Grad Univ, Quantum Syst Unit, Onna, Okinawa 9040495, Japan

Abstract: The recent experimental realization of spin-orbit (SO) coupling for spin-1 ultracold atoms opens an interesting avenue for exploring SO-coupling-related physics in large-spin systems, which is generally unattainable in electronic materials. In this paper, we study the effects of interactions between atoms on the ground states and collective excitations of SO-coupled spin-1 Bose-Einstein condensates (BECs) in the presence of a spin-tensor potential. We find that ferromagnetic interaction between atoms can induce a stripe phase exhibiting in-phase or out-of-phase modulating patterns between spin-tensor and zero-spin-component density waves. We characterize the phase transitions between different phases using the spin-tensor density as well as the collective dipole motion of the BEC. We show that there exists a double maxon-roton structure in the Bogoliubov-excitation spectrum, attributed to the three band minima of the SO-coupled spin-1 BEC.

Journal/Review: PHYSICAL REVIEW A

Volume: 93 (2)      Pages from: 023615-1  to: 023615-7

KeyWords: COLLOQUIUM
DOI: 10.1103/PhysRevA.93.023615

Citations: 46
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