Anomalous dispersion via dissipative coupling in a quantum well exciton-polariton microcavity
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arXiv
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| Format: | Preprint |
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2024
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| author | Biegańska, Dąbrówka Pieczarka, Maciej Schneider, Christian Höfling, Sven Klembt, Sebastian Syperek, Marcin |
| author_facet | Biegańska, Dąbrówka Pieczarka, Maciej Schneider, Christian Höfling, Sven Klembt, Sebastian Syperek, Marcin |
| contents | Although energy level repulsion is typically observed in interacting quantum systems, non-Hermitian physics predicts the effect of level attraction, which occurs when significant energy dissipation is present. Here, we show a manifestation of dissipative coupling in a high-quality AlGaAs-based polariton microcavity, where two polariton branches attract, resulting in an anomalous, inverted dispersion of the lower branch in momentum dispersion. Using angle-resolved photoluminescence measurements we observe the evolution of the level attraction with exciton-photon detuning, leading to changes in anomalous dispersion shape within a single sample. The dissipative coupling is explained by the interaction with an indirect exciton, acting as a highly dissipative channel in our system, and the observed dispersions are well captured within a phenomenological model. Our results present a new mechanism of dissipative coupling in light-matter systems and offer a tunable and well-controlled AlGaAs-based platform for engineering the non-Hermitian and negative mass effects in polariton systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_14116 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Anomalous dispersion via dissipative coupling in a quantum well exciton-polariton microcavity Biegańska, Dąbrówka Pieczarka, Maciej Schneider, Christian Höfling, Sven Klembt, Sebastian Syperek, Marcin Mesoscale and Nanoscale Physics Although energy level repulsion is typically observed in interacting quantum systems, non-Hermitian physics predicts the effect of level attraction, which occurs when significant energy dissipation is present. Here, we show a manifestation of dissipative coupling in a high-quality AlGaAs-based polariton microcavity, where two polariton branches attract, resulting in an anomalous, inverted dispersion of the lower branch in momentum dispersion. Using angle-resolved photoluminescence measurements we observe the evolution of the level attraction with exciton-photon detuning, leading to changes in anomalous dispersion shape within a single sample. The dissipative coupling is explained by the interaction with an indirect exciton, acting as a highly dissipative channel in our system, and the observed dispersions are well captured within a phenomenological model. Our results present a new mechanism of dissipative coupling in light-matter systems and offer a tunable and well-controlled AlGaAs-based platform for engineering the non-Hermitian and negative mass effects in polariton systems. |
| title | Anomalous dispersion via dissipative coupling in a quantum well exciton-polariton microcavity |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2404.14116 |