Chou Yang-Zhi, Levchenko Alex, Foster Matthew S
Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Phys Rev Lett. 2015 Oct 30;115(18):186404. doi: 10.1103/PhysRevLett.115.186404. Epub 2015 Oct 29.
We show that two-terminal transport can measure the Luttinger liquid (LL) parameter K, in helical LLs at the edges of two-dimensional topological insulators (TIs) with Rashba spin-orbit coupling. We consider a Coulomb drag geometry with two coplanar TIs and short-ranged spin-flip interedge scattering. Current injected into one edge loop induces circulation in the second, which floats without leads. In the low-temperature (T→0) perfect drag regime, the conductance is (e^{2}/h)(2K+1)/(K+1). At higher T, we predict a conductivity ~T^{-4K+3}. The conductivity for a single edge is also computed.
我们表明，在具有Rashba自旋轨道耦合的二维拓扑绝缘体（TI）边缘的螺旋卢廷格液体（LL）中，双端输运可以测量卢廷格液体参数K。我们考虑一种具有两个共面TI和短程自旋翻转边缘间散射的库仑拖拽几何结构。注入到一个边缘回路的电流会在第二个无引线悬浮的回路中感应出环流。在低温（T→0）完美拖拽 regime下，电导率为（e²/h）(2K + 1)/(K + 1)。在较高温度下，我们预测电导率约为T^(-4K + 3)。还计算了单个边缘的电导率。 （注：原文中“perfect drag regime”不太明确准确含义，这里保留英文未翻译，因为可能是特定专业术语且无明确通用中文对应，你可根据实际专业知识进一步确认或修改。）
