Extreme reduction of the spin-orbit splitting of the deep acceptor ground state of Zn(-)(S) in Si
Electric-dipole spin resonance of the deep acceptor Zn(-)(S) in Si reveals close gamma(8) and gamma(7) ground states with zero-field separation of only 0.31 meV as compared to the 43 meV of the two valence bands. With Lande's formula for the g factors of a 2T2 state split by spin-orbit interaction into gamma(8) and gamma(7) this nearness can be interpreted as strong quenching of the orbital moment. The observed dependence on the Zn isotopic mass indicates a dynamic contribution of the acceptor atom to the electronic state as is expected for a Jahn-Teller effect.
Schroth
H
1. Physikalisches Institut, Universitat Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
Lassmann
K
Voss
S
Bracht
H