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Dicke-type phase transition in a spin-orbit-coupled Bose–Einstein condensate

Author

Listed:
  • Chris Hamner

    (Washington State University)

  • Chunlei Qu

    (The University of Texas at Dallas)

  • Yongping Zhang

    (Washington State University
    Quantum System Unit, Okinawa Institute of Science and Technology)

  • JiaJia Chang

    (Washington State University)

  • Ming Gong

    (The University of Texas at Dallas
    The Chinese University of Hong Kong)

  • Chuanwei Zhang

    (Washington State University
    The University of Texas at Dallas)

  • Peter Engels

    (Washington State University)

Abstract

Spin-orbit-coupled Bose–Einstein condensates (BECs) provide a powerful tool to investigate interesting gauge field-related phenomena. Here we study the ground state properties of such a system and show that it can be mapped to the well-known Dicke model in quantum optics, which describes the interactions between an ensemble of atoms and an optical field. A central prediction of the Dicke model is a quantum phase transition between a superradiant phase and a normal phase. We detect this transition in a spin-orbit-coupled BEC by measuring various physical quantities across the phase transition. These quantities include the spin polarization, the relative occupation of the nearly degenerate single-particle states, the quantity analogous to the photon field occupation and the period of a collective oscillation (quadrupole mode). The applicability of the Dicke model to spin-orbit-coupled BECs may lead to interesting applications in quantum optics and quantum information science.

Suggested Citation

  • Chris Hamner & Chunlei Qu & Yongping Zhang & JiaJia Chang & Ming Gong & Chuanwei Zhang & Peter Engels, 2014. "Dicke-type phase transition in a spin-orbit-coupled Bose–Einstein condensate," Nature Communications, Nature, vol. 5(1), pages 1-8, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5023
    DOI: 10.1038/ncomms5023
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