NONEQUILIBRIUM MAGNETIZATION IN A BALLISTIC QUANTUM-DOT

We show that Aharonov-Bohm (AB) oscillations in the magnetic moment of an integrable ballistic quantum dot can be destroyed by a time depend ent magnetic flux. The effect is due to a nonequilibrium population of perfectly coherent electronic states. For real ballistic system the e quilibriation process, which involves a special type of inelastic elec tron backscattering, can be so ineffective that AB oscillations axe su ppressed when the flux varies with frequency omega approximately 10(7) -10(8) s-1. The effect can be used to measure relaxation times for ine lastic backscattering.