Positronium density measurements using polaritonic effects
- URL: http://arxiv.org/abs/2210.09875v1
- Date: Tue, 18 Oct 2022 14:08:24 GMT
- Title: Positronium density measurements using polaritonic effects
- Authors: Erika Cortese, David B. Cassidy and Simone De Liberato
- Abstract summary: We show how a dense Ps gas can be strongly coupled to the photonic field of a distributed reflector microcavity.
Given that polaritons can be created on a sub-cycle, a spectroscopic measurement of the vacuum Rabi splitting could be used as an ultrafast Ps density measurement.
- Score: 0.0
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: Recent experimental advances in Positronium (Ps) physics have made it
possible to produce dense Ps ensembles in which Ps-Ps interactions may occur,
leading to the production of Ps$_2$ molecules and paving the way to the
realization of a Ps Bose-Einstein Condensate (BEC). In order to achieve this
latter goal it would be advantageous to develop new methods to measure Ps
densities in real-time. Here we describe a possible approach to do this using
polaritonic methods: using realistic experimental parameters we demonstrate
that a dense Ps gas can be strongly coupled to the photonic field of a
distributed Bragg reflector microcavity. In this strongly coupled regime, the
optical spectrum of the system is composed of two hybrid positronium-polariton
resonances separated by the vacuum Rabi splitting, which is proportional to the
square root of the Ps density. Given that polaritons can be created on a
sub-cycle timescale, a spectroscopic measurement of the vacuum Rabi splitting
could be used as an ultra-fast Ps density measurement in regimes relevant to Ps
BEC formation. Moreover, we show how positronium-polaritons could potentially
enter the ultrastrong light-matter coupling regime, introducing a radically
novel platform to explore its non-perturbative phenomenology.
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