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首页> 外文期刊>Physical review letters >Unconventional Superfluid in a Two-Dimensional Fermi gas with Anisotropic Spin-Orbit Coupling and Zeeman fields
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Unconventional Superfluid in a Two-Dimensional Fermi gas with Anisotropic Spin-Orbit Coupling and Zeeman fields

机译：各向异性自旋轨道耦合和塞曼场的二维费米气体中的非常规超流体

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摘要

We study the phase diagram of a two-dimensional ultracold Fermi gas with the synthetic spin-orbit coupling (SOC) that has recently been realized at the National Institute of Standards and Technology (NIST). Because of the coexistence of anisotropic SOC and effective Zeeman fields in the NIST scheme, the system shows a rich structure of phase separation involving exotic gapless superfluid states and Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing states with different center-of-mass momenta. In particular, we characterize the stability region of FFLO states and demonstrate their unique features under SOC. We then show that the effective transverse Zeeman field in the NIST scheme can qualitatively change the landscape of the thermodynamic potential which leads to intriguing effects such as the disappearance of pairing instability, the competition between different FFLO states, and the stabilization of a fully gapped FFLO state. These interesting features may be probed, for example, by measuring the in situ density profiles or by the momentum-resolved radio-frequency spectroscopy.
机译：我们研究了具有合成自旋轨道耦合（SOC）的二维超冷费米气体的相图，该气体最近在美国国家标准技术研究院（NIST）上实现了。由于NIST方案中各向异性SOC和有效Zeeman场共存，因此该系统显示出丰富的相分离结构，涉及异质无隙超流体态和质心不同的Fulde-Ferrell-Larkin-Ovchinnikov（FFLO）配对态瞬间特别是，我们表征了FFLO状态的稳定区域，并展示了它们在SOC下的独特功能。然后，我们证明NIST方案中的有效横向Zeeman场可以定性地改变热力学势的态势，这会引起有趣的影响，如配对不稳定的消失，不同FFLO状态之间的竞争以及完全空缺的FFLO的稳定州。这些有趣的特征可以例如通过测量原位密度分布图或通过动量分辨的射频光谱法来探测。

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  • 来源
    《Physical review letters》 |2013年第11期|110401.1-110401.5|共5页
  • 作者

    Fan Wu; Guang-Can Guo; Wei Zhang; Wei Yi;

  • 作者单位

    Key Laboratory of Quantum Information, University of Science and Technology of China,CAS, Hefei, Anhui 230026, People's Republic of China;

    Key Laboratory of Quantum Information, University of Science and Technology of China,CAS, Hefei, Anhui 230026, People's Republic of China;

    Department of Physics, Renmin University of China, Beijing 100872, People's Republic of China;

    Key Laboratory of Quantum Information, University of Science and Technology of China,CAS, Hefei, Anhui 230026, People's Republic of China;

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