Suzuura Hidekatsu, Ando Tsuneya
Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan.
Phys Rev Lett. 2002 Dec 23;89(26):266603. doi: 10.1103/PhysRevLett.89.266603. Epub 2002 Dec 12.
We have calculated the weak-localization correction to the conductivity for disordered electrons in a two-dimensional honeycomb lattice and shown that it can be either positive or negative depending on the interaction range of impurity potentials. From symmetry considerations, the symplectic class turns out to be realized at nonzero temperatures and crossover to the orthogonal class is predicted with decreasing temperature.
我们计算了二维蜂窝晶格中无序电子电导率的弱局域修正，并表明其正负取决于杂质势的相互作用范围。从对称性考虑，辛类在非零温度下实现，且预计随着温度降低会转变为正交类。
