Enhanced fractional quantum Hall gaps in a two-dimensional electron gas coupled to a hovering split-ring resonator
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866908370811748352 |
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| author | Enkner, Josefine Graziotto, Lorenzo Boriçi, Dalin Appugliese, Felice Reichl, Christian Scalari, Giacomo Regnault, Nicolas Wegscheider, Werner Ciuti, Cristiano Faist, Jérôme |
| author_facet | Enkner, Josefine Graziotto, Lorenzo Boriçi, Dalin Appugliese, Felice Reichl, Christian Scalari, Giacomo Regnault, Nicolas Wegscheider, Werner Ciuti, Cristiano Faist, Jérôme |
| contents | The magnetotransport of a high-mobility two-dimensional electron gas coupled to a hovering split-ring resonator with controllable distance is studied in the quantum Hall regime. The measurements reveal an enhancement by more than a factor 2 of the quantum Hall energy gaps at the fractional filling factors 4/3, 5/3, and 7/5, alongside a concurrent reduction in exchange splitting at odd integer filling factors. Theoretically, we show the strength of both effects to be quantitatively compatible with the emergence of an effective electron-electron long-range attractive interaction mediated by the exchange of virtual cavity photons in the presence of significant spatial gradients of the cavity electric vacuum fields. These results unveil a compelling interplay between cavity quantum electrodynamics and electronic correlations in two-dimensional systems, with profound implications for the manipulation and control of quantum phases in 2D materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_18362 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Enhanced fractional quantum Hall gaps in a two-dimensional electron gas coupled to a hovering split-ring resonator Enkner, Josefine Graziotto, Lorenzo Boriçi, Dalin Appugliese, Felice Reichl, Christian Scalari, Giacomo Regnault, Nicolas Wegscheider, Werner Ciuti, Cristiano Faist, Jérôme Mesoscale and Nanoscale Physics Other Condensed Matter The magnetotransport of a high-mobility two-dimensional electron gas coupled to a hovering split-ring resonator with controllable distance is studied in the quantum Hall regime. The measurements reveal an enhancement by more than a factor 2 of the quantum Hall energy gaps at the fractional filling factors 4/3, 5/3, and 7/5, alongside a concurrent reduction in exchange splitting at odd integer filling factors. Theoretically, we show the strength of both effects to be quantitatively compatible with the emergence of an effective electron-electron long-range attractive interaction mediated by the exchange of virtual cavity photons in the presence of significant spatial gradients of the cavity electric vacuum fields. These results unveil a compelling interplay between cavity quantum electrodynamics and electronic correlations in two-dimensional systems, with profound implications for the manipulation and control of quantum phases in 2D materials. |
| title | Enhanced fractional quantum Hall gaps in a two-dimensional electron gas coupled to a hovering split-ring resonator |
| topic | Mesoscale and Nanoscale Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2405.18362 |