Uchino Shun, Ueda Masahito
RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan.
Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Phys Rev Lett. 2017 Mar 10;118(10):105303. doi: 10.1103/PhysRevLett.118.105303. Epub 2017 Mar 8.
Motivated by a recent experiment in ultracold atoms [S. Krinner et al., Proc. Natl. Acad. Sci. U.S.A. 113, 8144 (2016)PNASA60027-842410.1073/pnas.1601812113], we analyze transport of attractively interacting fermions through a one-dimensional wire near the superfluid transition. We show that in a ballistic regime where the conductance is quantized in the absence of interaction, the conductance is renormalized by superfluid fluctuations in reservoirs. In particular, the particle conductance is strongly enhanced, and the conductance plateau is blurred by emergent bosonic pair transport. For spin transport, in addition to the contact resistance, the wire itself is resistive, leading to a suppression of the measured spin conductance. Our results are qualitatively consistent with the experimental observations.
受近期超冷原子实验[S. Krinner等人，《美国国家科学院院刊》113, 8144 (2016)PNASA60027 - 842410.1073/pnas.1601812113]的启发，我们分析了在超流转变附近通过一维导线的吸引相互作用费米子的输运。我们表明，在弹道 regime 中，即在没有相互作用时电导是量子化的情况下，储层中的超流涨落会使电导重整化。特别是，粒子电导会显著增强，并且由于出现的玻色子对输运，电导平台会变得模糊。对于自旋输运，除了接触电阻外，导线本身也是有电阻的，这导致测量到的自旋电导受到抑制。我们的结果在定性上与实验观测一致。
