Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster I

Q 23.21: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent B

Controlled phonon dynamics in optomechanical systems — •Victor Ceban — Institute of Applied Physics, Moldova State University, Academiei str. 5, Chisinau, Moldova

There is a plethora of quantum optic phenomena enabling the control of the spontaneous emission effect, which results in suppression or increase of the spontaneous emission decay rate. Here, we show that this kind of phenomena can be explored in order to control the phonon behaviour in an optomechanical setup. Namely, the phonons seams to follow the changes introduced to the population decay dynamics of a considered emitter. Two different open quantum systems are presented.

In the first case, long-lived phonons are obtained when slowing-down the atomic decay of an emitter. An optomechanical setup made of an aromatic molecule embedded within an organic crystal is considered. Spontaneous emission suppression is achieved by placing the setup in a cavity and by modulating the emitter*s transition frequency. This effect becomes prominent for mechanical resonators with high damping rates, such as organic crystals.

In the second case, fast phonon dynamics is obtained when superradiant conditions are considered. An optomechanical system made of a collection of closely-spaced quantum dots placed on a vibrating membrane is considered. The quantum dot sample exhibits superradiance features which are transferred to the phonon dynamics

Keywords: optomechanics; optical control; phonon dynamics; molecule; quantum dot