A F Ioffe Institute of Russian Academy of Sciences, 194021 St Petersburg, Russia.
J Phys Condens Matter. 2012 Apr 4;24(13):135304. doi: 10.1088/0953-8984/24/13/135304. Epub 2012 Mar 9.
We have investigated within Fermi liquid theory the dependence of Coulomb drag current in a passive quantum wire on the applied voltage V across an active wire and on the temperature T for any values of eV/k(B)T. We assume that the bottoms of the 1D minibands in both wires almost coincide with the Fermi level. We conclude that: (1) within a certain temperature interval the drag current can be a descending function of the temperature T; (2) the experimentally observed temperature dependence T(-0.77) of the drag current can be interpreted within the framework of Fermi liquid theory; (3) at relatively high applied voltages the drag current saturates as a function of the applied voltage; and (4) the screening of the electron potential by metallic gate electrodes can be of importance.
我们在费米液体理论的框架内研究了在任意 eV/k(B)T 值下，被动量子线中的库仑拖拽电流随主动线两端的电压 V 和温度 T 的变化关系。我们假设两条线的一维次能带底部几乎与费米能级重合。我们的结论是：（1）在一定的温度区间内，拖拽电流可能是温度 T 的下降函数；（2）在费米液体理论的框架内，可以解释实验观测到的拖拽电流随温度的依赖关系 T(-0.77)；（3）在较高的外加电压下，拖拽电流作为外加电压的函数趋于饱和；（4）金属栅电极对电子势的屏蔽可能是重要的。
