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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
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De Liberato, Simone
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Amthor, M.
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Klass, M.
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Kamp, M.
d32fce80-53d8-47bc-bba2-d192aef18403
Worschech, L.
f5383458-f03b-4188-bd6f-ecc87c5697e6
Schneider, C.
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Höfling, S.
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Brodbeck, Sebastian
0e99ccef-2452-4d9e-8170-befdad561d44
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Amthor, M.
661d7d22-11b8-4194-b9bc-10f274b498c6
Klass, 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., Klass, 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, 17. (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.

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Experimental Verification of the Very Strong Coupling Regime in a GaAs Quantum Well Microcavity - Accepted Manuscript
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Accepted/In Press date: 2 June 2017
e-pub ahead of print date: 12 July 2017
Additional Information: Copy of AM now added, this should make this record compliant.

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Local EPrints ID: 412885
URI: https://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

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Date deposited: 07 Aug 2017 13:43
Last modified: 20 Jul 2019 00:39

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Contributors

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

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