Giant magnetodrag in graphene at charge neutrality.
Giant magnetodrag in graphene at charge neutrality.
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DOI：
10.1103/physrevlett.111.166601
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发表时间：
2013-03
影响因子：
8.6
通讯作者：
M. Titov;R. Gorbachev;B. Narozhny;T. Tudorovskiy;M. Schütt;P. Ostrovsky;I. Gornyi;A. Mirlin;M. Katsnelson;K. Novoselov;A. Geim;L. Ponomarenko
中科院分区：
文献类型：
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作者：
M. Titov;R. Gorbachev;B. Narozhny;T. Tudorovskiy;M. Schütt;P. Ostrovsky;I. Gornyi;A. Mirlin;M. Katsnelson;K. Novoselov;A. Geim;L. Ponomarenko
我们报告了在弱磁场中两个紧密放置的石墨烯单层之间的库仑阻力的实验数据和理论分析。在足够接近中性点时，每层中电子和空穴的共存导致拖曳电阻率的急剧增加。远离电荷中性，我们观察到非零霍尔阻力。所观察到的现象解释的去耦的电和准粒子电流是正交的电荷中性。磁阻力的符号取决于能量弛豫速率和样品的几何形状。
We report experimental data and theoretical analysis of Coulomb drag between two closely positioned graphene monolayers in a weak magnetic field. Close enough to the neutrality point, the coexistence of electrons and holes in each layer leads to a dramatic increase of the drag resistivity. Away from charge neutrality, we observe nonzero Hall drag. The observed phenomena are explained by decoupling of electric and quasiparticle currents which are orthogonal at charge neutrality. The sign of magnetodrag depends on the energy relaxation rate and geometry of the sample.