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arXiv 1607.02599cond-mat.quant-gascond-mat.supr-con
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自旋-轨道耦合费米超流体中相位可调的约瑟夫森结和自发质量流

Phase tunable Josephson junction and spontaneous mass current in a spin-orbit coupled Fermi superfluid

Lei Jiang, Yong Xu, Chuanwei Zhang

摘要:

原子电子学具有制造新型功能器件的潜力,如约瑟夫森结(JJ)。以往的研究主要集中在基态间具有0或$π$超导相位差的JJ,而相位任意可调的JJ在超导电子学和量子计算中可能有重要的应用。在这里,我们表明,相位可调JJ可以实现在自旋-轨道耦合的冷原子气体与磁隧穿势垒的自旋相关的聚焦激光束。我们认为JJ被限制在线性谐振势阱或圆环势阱中。在环形阱中,磁势垒诱导出JJ的基态自发质量流,证明了冷原子的磁电效应。

英文摘要:

Atomtronics has the potential for engineering new types of functional devices, such as Josephson junctions (JJs). Previous studies have mainly focused on JJs whose ground states have 0 or $π$ superconducting phase difference across the junctions, while arbitrarily tunable phase JJs may have important applications in superconducting electronics and quantum computation. Here we show that a phase tunable JJ can be implemented in a spin-orbit coupled cold atomic gas with the magnetic tunneling barrier generated by a spin-dependent focused laser beam. We consider the JJ confined in either a linear harmonic trap or a circular ring trap. In the ring trap, the magnetic barrier induces a spontaneous mass current for the ground state of the JJ, demonstrating the magnetoelectric effects of cold atoms.

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