Terahertz chiral sub-wavelength cavities breaking time-reversal symmetry via ultra-strong light-matter interaction
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866915260068265984 |
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| author | Andberger, Johan Graziotto, Lorenzo Sacchi, Luca Beck, Mattias Scalari, Giacomo Faist, Jérôme |
| author_facet | Andberger, Johan Graziotto, Lorenzo Sacchi, Luca Beck, Mattias Scalari, Giacomo Faist, Jérôme |
| contents | We demonstrate terahertz chiral sub-wavelength cavities that break time-reversal symmetry by coupling the degenerate linearly polarized modes of two orthogonal sets of nano-antenna arrays using the inter-Landau level transition of a two-dimensional electron gas in a perpendicular magnetic field, realizing normalized light-matter coupling rates up to $Ω_R/ω_{\mathrm{cav}} = 0.78$ with a dispersion that is modified by the parasitic capacitive coupling between the orthogonal antennas. The deep sub-wavelength confinement of the nano-antennas means that the ultra-strong coupling regime can be reached even with a small number of carriers compared to Fabry-Perot cavities, making it viable to be used with a variety of 2D materials. The non-degenerate circularly polarized ground state was only obtained after carefully optimizing the optical design to minimize the parasitic coupling to linearly polarized light. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_03195 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Terahertz chiral sub-wavelength cavities breaking time-reversal symmetry via ultra-strong light-matter interaction Andberger, Johan Graziotto, Lorenzo Sacchi, Luca Beck, Mattias Scalari, Giacomo Faist, Jérôme Mesoscale and Nanoscale Physics Optics We demonstrate terahertz chiral sub-wavelength cavities that break time-reversal symmetry by coupling the degenerate linearly polarized modes of two orthogonal sets of nano-antenna arrays using the inter-Landau level transition of a two-dimensional electron gas in a perpendicular magnetic field, realizing normalized light-matter coupling rates up to $Ω_R/ω_{\mathrm{cav}} = 0.78$ with a dispersion that is modified by the parasitic capacitive coupling between the orthogonal antennas. The deep sub-wavelength confinement of the nano-antennas means that the ultra-strong coupling regime can be reached even with a small number of carriers compared to Fabry-Perot cavities, making it viable to be used with a variety of 2D materials. The non-degenerate circularly polarized ground state was only obtained after carefully optimizing the optical design to minimize the parasitic coupling to linearly polarized light. |
| title | Terahertz chiral sub-wavelength cavities breaking time-reversal symmetry via ultra-strong light-matter interaction |
| topic | Mesoscale and Nanoscale Physics Optics |
| url | https://arxiv.org/abs/2308.03195 |