Spin-Phonon Interaction in Li-Doped Si

Abstract

A theory is given for the spin-phonon interaction in Li-doped Si, where Li donors have an “inverted” Group-V-like ground state. It is shown that the Hasegawa-Roth mechanism of spin-phonon interaction for the “normal” Group-V-like ground state is too small to explain the ultrasonic spin resonance (USR) observed by Wigmore. The spin-phonon interaction via the impurity spin-orbit coupling gives rise to a sufficiently strong attenuation of ultrasonic waves in qualitative agreement with the experiment of USR. It is pointed out that the complicated structure observed in USR is due to the effect of random strains in the crystal.