Electric field dependence of the positions and amplitudes of magnetophonon oscillations in n-InSb at 77 K

Abstract

The influence of pulsed electric fields on the magnetophonon structure in the transverse and longitudinal magnetoresistance of n-InSb at 77 K has been reexamined using a magnetic field modulation technique. For the transverse configuration, a shift to higher magnetic fields with increasing electric field is observed for the resistance maxima up to N = 8. The amplitudes decrease monotonously and disappear at about 60V/cm for N = 3. In the longitudinal case, the extrema shift to lower magnetic fields as the electric field is increased. In contrast to the transverse case, the amplitudes increase by a factor of 1.8 up to 15V/cm, and then either decrease or become saturated, depending on the harmonic number of the extremum under consideration. These experimental results are discussed within the context of calculations based on a quantum kinetic equation approach and predictions obtained from a simplified analytical theory.