The University of Southampton
University of Southampton Institutional Repository

Experimental verification of the very strong coupling regime in a GaAs quantum well microcavity

Experimental verification of the very strong coupling regime in a GaAs quantum well microcavity
Experimental verification of the very strong coupling regime in a GaAs quantum well microcavity
The dipole coupling strength g between cavity photons and quantum well excitons determines the regime of light matter coupling in quantum well microcavities. In the strong coupling regime, a reversible energy transfer between exciton and cavity photon takes place, which leads to the formation of hybrid polaritonic resonances. If the coupling is further increased, a hybridization of different single exciton states emerges, which is referred to as the very strong coupling regime. In semiconductor quantum wells such a regime is predicted to manifest as a photon-mediated electron-hole coupling leading to different excitonic wave functions for the two polaritonic branches when the ratio of the coupling strength to exciton binding energy g/EB approaches unity. Here, we verify experimentally the existence of this regime in magneto-optical measurements on a microcavity characterized by g/EB≈0.64, showing that the average electron-hole separation of the upper polariton is significantly increased compared to the bare quantum well exciton Bohr radius. This yields a diamagnetic shift around 0 detuning that exceeds the shift of the lower polariton by 1 order of magnitude and the bare quantum well exciton diamagnetic shift by a factor of 2. The lower polariton exhibits a diamagnetic shift smaller than expected from the coupling of a rigid exciton to the cavity mode, which suggests more tightly bound electron-hole pairs than in the bare quantum well.
1079-7114
Brodbeck, Sebastian
0e99ccef-2452-4d9e-8170-befdad561d44
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Amthor, M.
661d7d22-11b8-4194-b9bc-10f274b498c6
Klaas, M.
7eabc84e-c564-4bb5-a5b4-374a6a588e3e
Kamp, M.
d32fce80-53d8-47bc-bba2-d192aef18403
Worschech, L.
f5383458-f03b-4188-bd6f-ecc87c5697e6
Schneider, C.
62811bbc-2739-4dcf-b566-2a3921602895
Höfling, S.
46f0d11d-1c5a-4de9-a103-16b2686b4dda
Brodbeck, Sebastian
0e99ccef-2452-4d9e-8170-befdad561d44
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Amthor, M.
661d7d22-11b8-4194-b9bc-10f274b498c6
Klaas, M.
7eabc84e-c564-4bb5-a5b4-374a6a588e3e
Kamp, M.
d32fce80-53d8-47bc-bba2-d192aef18403
Worschech, L.
f5383458-f03b-4188-bd6f-ecc87c5697e6
Schneider, C.
62811bbc-2739-4dcf-b566-2a3921602895
Höfling, S.
46f0d11d-1c5a-4de9-a103-16b2686b4dda

Brodbeck, Sebastian, De Liberato, Simone, Amthor, M., Klaas, M., Kamp, M., Worschech, L., Schneider, C. and Höfling, S. (2017) Experimental verification of the very strong coupling regime in a GaAs quantum well microcavity. Physical Review Letters, 119 (2), [027401]. (doi:10.1103/PhysRevLett.119.027401).

Record type: Article

Abstract

The dipole coupling strength g between cavity photons and quantum well excitons determines the regime of light matter coupling in quantum well microcavities. In the strong coupling regime, a reversible energy transfer between exciton and cavity photon takes place, which leads to the formation of hybrid polaritonic resonances. If the coupling is further increased, a hybridization of different single exciton states emerges, which is referred to as the very strong coupling regime. In semiconductor quantum wells such a regime is predicted to manifest as a photon-mediated electron-hole coupling leading to different excitonic wave functions for the two polaritonic branches when the ratio of the coupling strength to exciton binding energy g/EB approaches unity. Here, we verify experimentally the existence of this regime in magneto-optical measurements on a microcavity characterized by g/EB≈0.64, showing that the average electron-hole separation of the upper polariton is significantly increased compared to the bare quantum well exciton Bohr radius. This yields a diamagnetic shift around 0 detuning that exceeds the shift of the lower polariton by 1 order of magnitude and the bare quantum well exciton diamagnetic shift by a factor of 2. The lower polariton exhibits a diamagnetic shift smaller than expected from the coupling of a rigid exciton to the cavity mode, which suggests more tightly bound electron-hole pairs than in the bare quantum well.

Text
Experimental Verification of the Very Strong Coupling Regime in a GaAs Quantum Well Microcavity - Accepted Manuscript
Download (410kB)

More information

Accepted/In Press date: 2 June 2017
e-pub ahead of print date: 12 July 2017
Published date: 12 July 2017
Additional Information: Copy of AM now added, this should make this record compliant.

Identifiers

Local EPrints ID: 412885
URI: http://eprints.soton.ac.uk/id/eprint/412885
ISSN: 1079-7114
PURE UUID: 5c5f3fc8-f0d6-4fae-ba0a-3dfe685fe212
ORCID for Simone De Liberato: ORCID iD orcid.org/0000-0002-4851-2633

Catalogue record

Date deposited: 07 Aug 2017 13:43
Last modified: 16 Mar 2024 04:14

Export record

Altmetrics

Contributors

Author: Sebastian Brodbeck
Author: M. Amthor
Author: M. Klaas
Author: M. Kamp
Author: L. Worschech
Author: C. Schneider
Author: S. Höfling

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

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×