Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session L02: Interacting Ultracold Gases, Light-Matter Coupling, and Cavities
8:00 AM–10:48 AM,
Wednesday, March 4, 2020
Sponsoring Unit: DAMOP
Chair: Michael Feig, Honeywell Intl
Abstract: L02.00002 : Interaction-induced long-time tail of a nonlinear ac absorption in a localized system: a relay-race mechanism*
View Presentation Abstract
(University of Utah)
(University of Utah)
In conventional solid-state electron systems with localized states the ac absorption is linear since the inelastic widths of the energy levels exceeds the drive amplitude. The situation is different in the systems of cold atoms in which phonons are absent. Then even a weak drive leads to saturation of the ac absorption within resonant pairs, so that the population of levels oscillates with the Rabi frequency. We demonstrate that, in the presence of weak dipole-dipole interactions, the response of the system acquires a long-time component which oscillates with frequency much smaller than the Rabi frequency. The underlying mechanism of this long-time behavior is that the fields created in the course of the Rabi oscillations serve as resonant drive for the second-generation Rabi oscillations in pairs with level spacings close to the Rabi frequency. The frequency of the second-generation oscillations is of the order of interaction strength. As these oscillations develop, they can initiate the next-generation Rabi oscillations, and so on. Formation of the second-generation oscillations is facilitated by the non-diagonal component of the dipole-dipole interaction tensor.
*The work was supported by the Department of Energy, Office of Basic Energy Sciences, Grant No. DE- FG02- 06ER46313.
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