Electron-Electron Umklapp Process in Two-Dimensional Electron Gas under a Spatially Alternating Magnetic Field

Abstract

We have studied the transport phenomenon in two-dimensional electron gas at a GaAs/AlGaAs heterointerface placed in a spatially alternating magnetic field. The effect of the periodic magnetic field is twofold. One is the effective mass renormalization which manifests itself as resistivity enhancement in the T → 0 limit. The other is a T²-dependent relaxation rate which is attributed to the electron-electron Umklapp scattering. A similar phenomenon observed at higher bias current provides additional support to this interpretation and forms a basis for a new method of hot electron thermometry.