Dynamically Driven Irreversibility in Many Body Quantum Systems: An experimental approach

Дата и время публикации : 1998-03-03T19:10:33Z

Авторы публикации и институты :
Gonzalo Usaj
Horacio M. Pastawski
Patricia R. Levstein

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: RevTeX, 4 pages, 4 Postscript figures
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: The NMR technique allows one to create a non-equilibrium local polarization and to detect its later evolution. By a change of the sign of the effective dipolar Hamiltonian, the apparently diffusive dynamics is reverted, generating a polarization echo (PE). This echo attenuates as a function of the time $t_R$ elapsed until the dynamics is reverted. We report a set of experiments where we slow down the dipolar dynamics showing that it controls this irreversibility. In cobaltocene, a cross over from Gaussian to exponential PE attenuation is found; in ferrocene the exponential regime is not reached. We conclude that many-body quantum systems have intrinsic instabilities, which amplify the environment fluctuations and hinder their backward evolution.

Category: Physics