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Tunnelling of spin-orbit coupled Bose-Einstein condensates in driven double-well potential

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Abstract

The tunnelling dynamics of spin-orbit (SO) coupled Bose-Einstein condensates in a periodically driven double-well potential are investigated both theoretically and numerically. We find that, when the SO coupling is absent, the atomic interactions suppress the tunnelling (as in usual Bose-Einstein condensed system), and the Zeeman field does not influence the usual tunnelling. When the SO coupling is present, the coupling of the atomic interactions and the Zeeman-field intensity can either enhance or suppress the tunnelling. The system undergoes rich transformations from the coherent tunnelling (CT) to the coherent destruction of tunnelling (CDT) when the SO coupling or the atomic interactions or the Zeeman-field intensity changes. In high-frequency region, the triangular structure and the circle structure are revealed in quasi-energy bands of the system, the width of the triangular structure or the circle structure and the localization width are relevant. And the SO coupling modifies traditional degenerate modes of quasi-energy bands. The results provide a possible way to control the usual tunnelling and the spin-flipping tunnelling in double-well potential.

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Authors and Affiliations

  1. Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou, 730070, P.R. China

    Zhen-Xia Niu, Ai-Xia Zhang & Ju-Kui Xue

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  1. Zhen-Xia Niu
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  2. Ai-Xia Zhang
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  3. Ju-Kui Xue
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Correspondence to Ju-Kui Xue.

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Niu, ZX., Zhang, AX. & Xue, JK. Tunnelling of spin-orbit coupled Bose-Einstein condensates in driven double-well potential. Eur. Phys. J. D 70, 169 (2016). https://doi.org/10.1140/epjd/e2016-60637-4

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