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Exciton-light coupling in quantum wells: from motional narrowing to superradiance

Exciton-light coupling in quantum wells: from motional narrowing to superradiance
Exciton-light coupling in quantum wells: from motional narrowing to superradiance
We show numerically that spatial delocalization of excition-polariton states in multiple quantum wells leads to efficient narrowing of exciton resonances with respect to the single-quantum-well (QW) case. This is a manifestation of a motional narrowing effect, i.e., averaging of short-range potential fluctuations by extended exciton-polariton modes. Increasing the number of QW’s or decreasing the degree of disorder, one recovers the superradiance regime where the exciton linewidth is governed by the splitting between the strongest exciton-polariton modes and now increases with an increasing number of QW’s. Vertical disorder, in which the different wells are no longer equivalent, suppresses both effects.
1550-235X
R12697-R12700
Kavokin, A.V.
70ffda66-cfab-4365-b2db-c15e4fa1116b
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07
Kavokin, A.V.
70ffda66-cfab-4365-b2db-c15e4fa1116b
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07

Kavokin, A.V. and Baumberg, J.J. (1998) Exciton-light coupling in quantum wells: from motional narrowing to superradiance. Physical Review B, 57 (20), R12697-R12700. (doi:10.1103/PhysRevB.57.R12697).

Record type: Article

Abstract

We show numerically that spatial delocalization of excition-polariton states in multiple quantum wells leads to efficient narrowing of exciton resonances with respect to the single-quantum-well (QW) case. This is a manifestation of a motional narrowing effect, i.e., averaging of short-range potential fluctuations by extended exciton-polariton modes. Increasing the number of QW’s or decreasing the degree of disorder, one recovers the superradiance regime where the exciton linewidth is governed by the splitting between the strongest exciton-polariton modes and now increases with an increasing number of QW’s. Vertical disorder, in which the different wells are no longer equivalent, suppresses both effects.

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Published date: May 1998
Organisations: Physics & Astronomy

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Local EPrints ID: 256719
URI: http://eprints.soton.ac.uk/id/eprint/256719
ISSN: 1550-235X
PURE UUID: 1447e3d1-42e8-4ac2-8f15-b02b4352ef1e

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Date deposited: 09 Aug 2002
Last modified: 20 Nov 2021 05:20

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Contributors

Author: A.V. Kavokin
Author: J.J. Baumberg

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