Strong Coulomb drag and broken symmetry in double-layer graphene
Strong Coulomb drag and broken symmetry in double-layer graphene
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DOI：
10.1038/nphys2441
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发表时间：
2012-12-01
期刊：
影响因子：
19.6
通讯作者：
Ponomarenko, L. A.
中科院分区：
文献类型：
--
作者：
Gorbachev, R. V.;Geim, A. K.;Ponomarenko, L. A.
库仑阻力是在空间分离的导电层中流动的电流之间的摩擦耦合。它是由层间电子-电子相互作用引起的。以前，只能通过实验研究弱 (d >> l) 到中间 (d 类似于 l) 耦合的情况，其中 d 是层间间隔，l 是电荷载流子之间的特征距离。在这里，我们使用 d 低至 1 nm 的石墨烯-氮化硼异质结构来探测极限 d 中的库仑阻力
Coulomb drag is a frictional coupling between electric currents flowing in spatially separated conducting layers. It is caused by interlayer electron-electron interactions. Previously, only the regime of weak (d >> l) to intermediate (d similar to l) coupling could be studied experimentally, where d is the interlayer separation and l is the characteristic distance between charge carriers. Here we use graphene-boron-nitride heterostructures with d down to 1 nm to probe Coulomb drag in the limit d