Positronium density measurements using polaritonic effects
Positronium density measurements using polaritonic effects
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 Ps2 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 novel platform to explore its non-perturbative phenomenology.
Cortese, Erika
3a7d67d1-3321-40b2-91fa-2471dbed7147
Cassidy, David B.
a453b605-a539-4c81-841c-937e810b0ba4
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
10 February 2023
Cortese, Erika
3a7d67d1-3321-40b2-91fa-2471dbed7147
Cassidy, David B.
a453b605-a539-4c81-841c-937e810b0ba4
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Cortese, Erika, Cassidy, David B. and De Liberato, Simone
(2023)
Positronium density measurements using polaritonic effects.
Physical Review A, 107 (2), [023306].
(doi:10.1103/PhysRevA.107.023306).
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 Ps2 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 novel platform to explore its non-perturbative phenomenology.
Text
XY10638-2
- Accepted Manuscript
More information
Accepted/In Press date: 23 January 2023
Published date: 10 February 2023
Additional Information:
S.D.L. acknowledges support from a University Research Fellowship of the Royal Society and from the Phillip Leverhulme prize of the Leverhulme Trust. S.D.L. and E.C. acknowledge funding from the Leverhulme Trust through Grant No. RPG-2022-037. D.B.C acknowledges support from EPSRC via Grant No. EP/S036571/1.
Publisher Copyright:
© 2023 American Physical Society.
Identifiers
Local EPrints ID: 474686
URI: http://eprints.soton.ac.uk/id/eprint/474686
ISSN: 2469-9926
PURE UUID: d0e91824-6d60-46fa-85d6-ef9bd0852a75
Catalogue record
Date deposited: 01 Mar 2023 17:40
Last modified: 17 Mar 2024 03:31
Export record
Altmetrics
Contributors
Author:
David B. Cassidy
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
