Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA and School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
Phys Rev Lett. 2013 Sep 20;111(12):126601. doi: 10.1103/PhysRevLett.111.126601. Epub 2013 Sep 17.
Massless Dirac fermions in graphene at charge neutrality form a strongly interacting system in which both charged and neutral (energy) modes play an important role. These modes are essentially decoupled in the absence of a magnetic field, but become strongly coupled when the field is applied. We show that this regime is characterized by strong magnetodrag and Hall drag, originating from long-range energy currents and spatial temperature gradients. The energy-driven effects arise in a wide temperature range, and feature an unusually strong dependence on field and carrier density. We argue that this mechanism accounts for the recently observed giant magnetodrag and Hall drag occurring at classically weak fields.
在中性电荷下，石墨烯中的无质量狄拉克费米子形成了一个强相互作用的系统，其中带电和中性（能量）模式都起着重要的作用。在没有磁场的情况下，这些模式基本上是解耦的，但当施加磁场时，它们就会变得强烈耦合。我们表明，这种状态的特点是强磁拖拽和霍尔拖拽，这源于远程能量流和空间温度梯度。能量驱动的效应出现在很宽的温度范围内，并且对场和载流子密度有着异常强烈的依赖性。我们认为，这种机制解释了最近在经典弱磁场中观察到的巨大磁拖拽和霍尔拖拽现象。
