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Abstract

Transport measurement is one of the most important ways to study the properties of matter. In this article, we discuss recent experiments in ultracold atomic gases where the analog of Landauer transport in mesoscopic devices is realized and spin dynamics in a strongly interacting Fermi gas is probed. In the latter case, we pay special attention to the peculiarity of spin dynamics due to identical spin rotation effect which leads to a novel form of spin diffusion current. This modifies the usual diffusion equation into a more complicated form and leads to important consequence for, in particular, transverse spin diffusion in ultracold Fermi gases.

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Authors and contacts

Zhang Shi-Zhong

Corresponding author:Zhang Shi-Zhong,shizhong@hku.hk

Funds:Hong Kong Research Grant Council, General research fund (Grant No. 17303215), and Croucher Foundation.

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	长度尺度	备注
经典气体	${\lambda _T} < {r_0} < d$	经典散射; 麦克斯韦-玻尔兹曼经典分布
量子气体	${r_0} < {\lambda _T} < d$	量子散射; 麦克斯韦-玻尔兹曼经典分布
量子简并气体	${r_0} < d < {\lambda _T}$	量子散射; 玻色-爱因斯坦或者费米- 狄拉克分布

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	实验测量值 (单位$\frac{\hbar }{m}$)	实验组
二维费米系统横向自旋扩散	0.0067	剑桥^[8]
二维费米系统横向自旋扩散	1.7	多伦多^[9]
三维费米系统纵向自旋扩散	1.34	MIT^[6]
三维费米系统横向自旋扩散	1.08	多伦多^[7]

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Vol. 68, Issue 4 - 2019-02-20

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