Electric-Dipole-Excited Electron Spin Resonance in InSb

Abstract
Electric-dipole-excited electron spin resonance (EDE-ESR) has been observed in several samples of InSb in the far infrared. A qualitative discussion of the linewidth is given in terms of conduction-band nonparabolicity. Electron g values for the lowest Landau level obtained from these measurements are in disagreement with previous calculations and indirect measurements. These accurate spin energies provide evidence against the proposed existence of a strong electron-TO-phonon interaction in InSb.