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Coherently driven microcavity-polaritons and the question of superfluidity
Due to their driven-dissipative nature, photonic quantum fluids present new challenges in understanding superfluidity. Some associated effects have been observed, and notably the report of nearly dissipationless flow for coherently driven microcavity-polaritons was taken as a smoking gun for superfl...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6170389/ https://www.ncbi.nlm.nih.gov/pubmed/30282978 http://dx.doi.org/10.1038/s41467-018-06436-2 |
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author | Juggins, R. T. Keeling, J. Szymańska, M. H. |
author_facet | Juggins, R. T. Keeling, J. Szymańska, M. H. |
author_sort | Juggins, R. T. |
collection | PubMed |
description | Due to their driven-dissipative nature, photonic quantum fluids present new challenges in understanding superfluidity. Some associated effects have been observed, and notably the report of nearly dissipationless flow for coherently driven microcavity-polaritons was taken as a smoking gun for superflow. Here, we show that the superfluid response—the difference between responses to longitudinal and transverse forces—is zero for coherently driven polaritons. This is a consequence of the gapped excitation spectrum caused by external phase locking. Furthermore, while a normal component exists at finite pump momentum, the remainder forms a rigid state that is unresponsive to either longitudinal or transverse perturbations. Interestingly, the total response almost vanishes when the real part of the excitation spectrum has a linear dispersion, which was the regime investigated experimentally. This suggests that the observed suppression of scattering should be interpreted as a sign of this new rigid state and not a superfluid. |
format | Online Article Text |
id | pubmed-6170389 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-61703892018-10-09 Coherently driven microcavity-polaritons and the question of superfluidity Juggins, R. T. Keeling, J. Szymańska, M. H. Nat Commun Article Due to their driven-dissipative nature, photonic quantum fluids present new challenges in understanding superfluidity. Some associated effects have been observed, and notably the report of nearly dissipationless flow for coherently driven microcavity-polaritons was taken as a smoking gun for superflow. Here, we show that the superfluid response—the difference between responses to longitudinal and transverse forces—is zero for coherently driven polaritons. This is a consequence of the gapped excitation spectrum caused by external phase locking. Furthermore, while a normal component exists at finite pump momentum, the remainder forms a rigid state that is unresponsive to either longitudinal or transverse perturbations. Interestingly, the total response almost vanishes when the real part of the excitation spectrum has a linear dispersion, which was the regime investigated experimentally. This suggests that the observed suppression of scattering should be interpreted as a sign of this new rigid state and not a superfluid. Nature Publishing Group UK 2018-10-03 /pmc/articles/PMC6170389/ /pubmed/30282978 http://dx.doi.org/10.1038/s41467-018-06436-2 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Juggins, R. T. Keeling, J. Szymańska, M. H. Coherently driven microcavity-polaritons and the question of superfluidity |
title | Coherently driven microcavity-polaritons and the question of superfluidity |
title_full | Coherently driven microcavity-polaritons and the question of superfluidity |
title_fullStr | Coherently driven microcavity-polaritons and the question of superfluidity |
title_full_unstemmed | Coherently driven microcavity-polaritons and the question of superfluidity |
title_short | Coherently driven microcavity-polaritons and the question of superfluidity |
title_sort | coherently driven microcavity-polaritons and the question of superfluidity |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6170389/ https://www.ncbi.nlm.nih.gov/pubmed/30282978 http://dx.doi.org/10.1038/s41467-018-06436-2 |
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