强关联二维电子系统中跳跃磁电阻前因子的量子化
Quantisation of Hopping Magnetoresistance Prefactor in Strongly Correlated Two-Dimensional Electron Systems
摘要：
本文报道了强相互作用介观二维电子系统（2DES）中普遍存在的跳跃输运行为。在背景无序的某一窗口中，在低垂直磁场下的电阻率遵循预期的关系式$ρ(B_\perp) = ρ_{\rm{B}}\exp(αB_\perp^2)$。前因子$ρ_{\rm{B}}$随着电子密度的增加呈指数下降，但在较高密度下饱和到有限值。引人注目的是，当以绝对电阻表示时，发现该值是通用的，并且在$R_{\rm{B}}\approx h/e^2$和$R_{\rm{B}}\approx 1/2$ $ h/e^2$处显示量化。我们建议一个强相关的电子相作为一种可能的解释。
英文摘要：
We report an universal behaviour of hopping transport in strongly interacting mesoscopic two-dimensional electron systems (2DES). In a certain window of background disorder, the resistivity at low perpendicular magnetic fields follows the expected relation $ρ(B_\perp) = ρ_{\rm{B}}\exp(αB_\perp^2)$. The prefactor $ρ_{\rm{B}}$ decreases exponentially with increasing electron density but saturates to a finite value at higher densities. Strikingly, this value is found to be universal when expressed in terms of absolute resistance and and shows quantisation at $R_{\rm{B}}\approx h/e^2$ and $R_{\rm{B}}\approx 1/2$ $ h/e^2$. We suggest a strongly correlated electronic phase as a possible explanation.
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