Magneto-transport characteristics of a 2D electron system driven to negative magneto-conductivity by microwave photoexcitation

作者：Mani R G^*; Kriisa A

来源：Scientific Reports, 2013, 3(1): 3478.

DOI：10.1038/srep03478

Negative diagonal magneto-conductivity/resistivity is a spectacular-and thought provoking-property of driven, far-from-equilibrium, low dimensional electronic systems. The physical response of this exotic electronic state is not yet fully understood since it is rarely encountered in experiment. The microwave-radiation-induced zero-resistance state in the high mobility GaAs/AlGaAs 2D electron system is believed to be an example where negative magneto-conductivity/resistivity is responsible for the observed phenomena. Here, we examine the magneto-transport characteristics of this negative conductivity/resistivity state in the microwave photo-excited two-dimensional electron system (2DES) through a numerical solution of the associated boundary value problem. The results suggest, surprisingly, that a bare negative diagonal conductivity/resistivity state in the 2DES under photo-excitation should yield a positive diagonal resistance, with a concomitant sign reversal in the Hall voltage.

• 出版日期2013-12-11