Hot-electron magnetophonon resonance in n-type germanium in pulsed high magnetic fields up to 40 T

Abstract

Hot-electron magnetophonon resonances in n-type Ge samples have been investigated in pulsed high magnetic fields up to 40 T for B//I//(110), (111) and (100) directions at a fixed temperature of 20 K. Owing to the high magnetic fields, an observation of almost all resonance series of both intervalley and intravalley processes from the first harmonic number (Landau quantum number N=1) has become possible for the first time. The resonant cooling process of electrons was consistently understood by taking into account an initial energy distribution of electrons, anisotropy of the effective mass at each valley and the mobility change toward the current direction.