Coulomb drag at zero temperature.
Coulomb drag at zero temperature.
复制标题
零温度下的库仑阻力。
DOI：
--
复制
发表时间：
2007
影响因子：
8.6
通讯作者：
A. Kamenev
中科院分区：
文献类型：
--
作者：
A. Levchenko;A. Kamenev
我们表明，库仑阻力效应在小的温度下表现出饱和，当计算到第三阶的层间相互作用。零温跨阻的量级为h/（e2 g3），其中g是无量纲的薄层电导。因此，该效应在低迁移率样品中最强。这种行为应该与传统的（二阶）预测相反，该预测认为跨阻随温度的一定幂而变化，并且（几乎）与迁移率无关。结果表明，在双层系统中，零温阻力并不是强耦合态的明确标志。
We show that the Coulomb drag effect exhibits saturation at small temperatures, when calculated to the third order in the interlayer interactions. The zero-temperature transresistance is of the order h/(e2g3), where g is the dimensionless sheet conductance. The effect is therefore the strongest in low mobility samples. This behavior should be contrasted with the conventional (second order) prediction that the transresistance scales as a certain power of temperature and is (almost) mobility independent. The result demonstrates that the zero-temperature drag is not an unambiguous signature of a strongly coupled state in double-layer systems.