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Raman-dressed spin-1 spin-orbit-coupled quantum gas

Raman-dressed spin-1 spin-orbit-coupled quantum gas
Raman-dressed spin-1 spin-orbit-coupled quantum gas
The recently realized spin-orbit-coupled quantum gases [Lin et al., Nature (London) 471, 83 (2011); Wang et al., Phys. Rev. Lett. 109, 095301 (2012); Cheuk et al., Phys. Rev. Lett. 109, 095302 (2012)] mark a breakthrough in the cold atom community. In these experiments, two hyperfine states are selected from a hyperfine manifold to mimic a pseudospin-1/2 spin-orbit-coupled system by the method of Raman dressing, which is applicable to both bosonic and fermionic gases. In this paper, we show that the method used in these experiments can be generalized to create any large pseudospin spin-orbit-coupled gas if more hyperfine states are coupled equally by the Raman lasers. As an example, we study, in detail, a quantum gas with three hyperfine states coupled by the Raman lasers and show, when the state-dependent energy shifts of the three states are comparable, triple-degenerate minima will appear at the bottom of the band dispersions, thus, realizing a spin-1 spin-orbit-coupled quantum gas. A novel feature of this three-minima regime is that there can be two different kinds of stripe phases with different wavelengths, which has an interesting connection to the ferromagnetic and polar phases of spin-1 spinor Bose-Einstein condensates without spin-orbit coupling
1050-2947
23630
Lan, Zhihao
003078e8-2b5c-4e32-9ead-a6b511af08c8
Öhberg, Patrik
c3cc59f5-12a1-4064-93f2-02a6146c9c1e
Lan, Zhihao
003078e8-2b5c-4e32-9ead-a6b511af08c8
Öhberg, Patrik
c3cc59f5-12a1-4064-93f2-02a6146c9c1e

Lan, Zhihao and Öhberg, Patrik (2014) Raman-dressed spin-1 spin-orbit-coupled quantum gas. Physical Review A, 89 (2), 23630. (doi:10.1103/PhysRevA.89.023630).

Record type: Article

Abstract

The recently realized spin-orbit-coupled quantum gases [Lin et al., Nature (London) 471, 83 (2011); Wang et al., Phys. Rev. Lett. 109, 095301 (2012); Cheuk et al., Phys. Rev. Lett. 109, 095302 (2012)] mark a breakthrough in the cold atom community. In these experiments, two hyperfine states are selected from a hyperfine manifold to mimic a pseudospin-1/2 spin-orbit-coupled system by the method of Raman dressing, which is applicable to both bosonic and fermionic gases. In this paper, we show that the method used in these experiments can be generalized to create any large pseudospin spin-orbit-coupled gas if more hyperfine states are coupled equally by the Raman lasers. As an example, we study, in detail, a quantum gas with three hyperfine states coupled by the Raman lasers and show, when the state-dependent energy shifts of the three states are comparable, triple-degenerate minima will appear at the bottom of the band dispersions, thus, realizing a spin-1 spin-orbit-coupled quantum gas. A novel feature of this three-minima regime is that there can be two different kinds of stripe phases with different wavelengths, which has an interesting connection to the ferromagnetic and polar phases of spin-1 spinor Bose-Einstein condensates without spin-orbit coupling

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PhysRevA.89.023630 - Version of Record
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Published date: 24 February 2014
Organisations: Mathematical Sciences

Identifiers

Local EPrints ID: 369446
URI: https://eprints.soton.ac.uk/id/eprint/369446
ISSN: 1050-2947
PURE UUID: 0472653c-ecdc-4872-a764-ca7790c08d67

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Date deposited: 26 Sep 2014 13:08
Last modified: 16 Sep 2019 18:31

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