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Nonlinear electric transport in graphene with magnetic disorder

机译：石墨烯中具有磁性紊乱的非线性电输运

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摘要

The influence of magnetic impurities on the transport properties of graphene is investigated in the regime of strong applied electric fields. As a result of electron-hole pair creation, the response becomes nonlinear and dependent on the magnetic polarization. In the paramagnetic phase, time reversal symmetry is statistically preserved, and transport properties are similar to the clean case. At variance, in the antiferromagnetic phase, the system undergoes a transition between a superdiffusive to a subdiffusive spreading of a wave packet, signaling the development of localized states. This critical regime is characterized by the appearance of electronic states with a multifractal geometry near the gap. The local density of states concentrates in large patches having a definite charge-spin correlation. In this state, the conductivity tends to half the minimum conductivity of clean graphene.
机译：在强电场作用下研究了磁性杂质对石墨烯输运性能的影响。创建电子-空穴对的结果是，响应变为非线性并取决于磁极化。在顺磁性阶段，时间逆转对称性得到统计保留，传输特性与纯净情况相似。在反铁磁阶段中，系统在变化过程中会经历波包的超扩散扩展与次扩散扩展之间的过渡，这标志着局部状态的发展。该临界状态的特征是在间隙附近具有多重分形几何形状的电子态的出现。状态的局部密度集中在具有确定的电荷-自旋相关性的大斑块中。在这种状态下，电导率往往是纯石墨烯最小电导率的一半。

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