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Power-law decay of the spatial correlation function in exciton-polariton condensates
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Roumpos, G., Lohse, M., Nitsche, W. H., Keeling, J., Szymanska, M. H. (Marzena H.), Littlewood, Peter B., Loffler, A., Hofling, S., Worschech, L., Forchel, A. and Yamamoto, Y. (2012) Power-law decay of the spatial correlation function in exciton-polariton condensates. Proceedings of the National Academy of Sciences of the United States of America, Vol.109 (No.17). pp. 6467-6472. doi:10.1073/pnas.1107970109 ISSN 0027-8424.
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Official URL: http://dx.doi.org/10.1073/pnas.1107970109
Abstract
We create a large exciton-polariton condensate and employ a Michelson interferometer setup to characterize the short- and long-distance behavior of the first order spatial correlation function. Our experimental results show distinct features of both the two-dimensional and nonequilibrium characters of the condensate. We find that the gaussian short-distance decay is followed by a power-law decay at longer distances, as expected for a two-dimensional condensate. The exponent of the power law is measured in the range 0.9-1.2, larger than is possible in equilibrium. We compare the experimental results to a theoretical model to understand the features required to observe a power law and to clarify the influence of external noise on spatial coherence in nonequilibrium phase transitions. Our results indicate that Berezinskii- Kosterlitz-Thouless-like phase order survives in open-dissipative systems.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Proceedings of the National Academy of Sciences of the United States of America | ||||
Publisher: | National Academy of Sciences | ||||
ISSN: | 0027-8424 | ||||
Official Date: | 24 April 2012 | ||||
Dates: |
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Volume: | Vol.109 | ||||
Number: | No.17 | ||||
Page Range: | pp. 6467-6472 | ||||
DOI: | 10.1073/pnas.1107970109 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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