Nilsson Johan, Neto A H Castro, Guinea F, Peres N M R
Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA.
Phys Rev Lett. 2006 Dec 31;97(26):266801. doi: 10.1103/PhysRevLett.97.266801. Epub 2006 Dec 26.
We study the effects of disorder in the electronic properties of graphene multilayers, with special focus on the bilayer and the infinite stack. At low energies and long wavelengths, the electronic self-energies and density of states exhibit behavior with divergences near half filling. As a consequence, the spectral functions and the conductivities acquire anomalous properties. In particular, we show that the quasiparticle decay rate has a minimum as a function of energy, there is a universal minimum value for the in-plane conductivity of order e(2)/h per plane and, unexpectedly, the c-axis conductivity is enhanced by disorder at low doping, leading to an enormous conductivity anisotropy at low temperatures.
我们研究了无序对石墨烯多层膜电子性质的影响，特别关注双层和无限堆叠结构。在低能量和长波长下，电子自能和态密度在半填充附近呈现出发散行为。因此，光谱函数和电导率具有反常性质。具体而言，我们表明准粒子衰减率作为能量的函数存在一个最小值，每个平面的面内电导率存在一个约为e(2)/h的普遍最小值，并且出乎意料的是，在低掺杂时无序会增强c轴电导率，导致在低温下出现巨大的电导率各向异性。
