THz ultra-strong light-matter coupling up to 200K with continuously-graded parabolic quantum wells
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866918189299924992 |
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| author | Goulain, Paul Deimert, Chris Jeannin, Mathieu Pirotta, Stefano Pasek, Wojciech Julian Wasilewski, Zbigniew Colombelli, Raffaele Manceau, Jean-Michel |
| author_facet | Goulain, Paul Deimert, Chris Jeannin, Mathieu Pirotta, Stefano Pasek, Wojciech Julian Wasilewski, Zbigniew Colombelli, Raffaele Manceau, Jean-Michel |
| contents | Continuously graded parabolic quantum wells with excellent optical performances are used to overcome the low-frequency and thermal limitations of square quantum wells at terahertz frequencies. The formation of microcavity intersubband polaritons at frequencies as low as 1.8 THz is demonstrated, with a sustained ultra-strong coupling regime up to a temperature of 200K. It is additionally shown that the ultra-strong coupling regime is preserved when the active region is embedded in sub-wavelength resonators, with an estimated relative strength $η= Ω_R / ω_0 = 0.12$. This represents an important milestone for future studies of quantum vacuum radiation because such resonators can be optically modulated at ultrafast rates, possibly leading to the generation of non-classical light via the dynamic Casimir effect. Finally, with an effective volume of $2.10^{-6} λ_0^3$, it is estimated that fewer than 3000 electrons per resonator are ultra-strongly coupled to the quantized electromagnetic mode, proving it is also a promising approach to explore few-electron polaritonic systems operating at relatively high temperatures. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2301_09410 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | THz ultra-strong light-matter coupling up to 200K with continuously-graded parabolic quantum wells Goulain, Paul Deimert, Chris Jeannin, Mathieu Pirotta, Stefano Pasek, Wojciech Julian Wasilewski, Zbigniew Colombelli, Raffaele Manceau, Jean-Michel Optics Mesoscale and Nanoscale Physics Continuously graded parabolic quantum wells with excellent optical performances are used to overcome the low-frequency and thermal limitations of square quantum wells at terahertz frequencies. The formation of microcavity intersubband polaritons at frequencies as low as 1.8 THz is demonstrated, with a sustained ultra-strong coupling regime up to a temperature of 200K. It is additionally shown that the ultra-strong coupling regime is preserved when the active region is embedded in sub-wavelength resonators, with an estimated relative strength $η= Ω_R / ω_0 = 0.12$. This represents an important milestone for future studies of quantum vacuum radiation because such resonators can be optically modulated at ultrafast rates, possibly leading to the generation of non-classical light via the dynamic Casimir effect. Finally, with an effective volume of $2.10^{-6} λ_0^3$, it is estimated that fewer than 3000 electrons per resonator are ultra-strongly coupled to the quantized electromagnetic mode, proving it is also a promising approach to explore few-electron polaritonic systems operating at relatively high temperatures. |
| title | THz ultra-strong light-matter coupling up to 200K with continuously-graded parabolic quantum wells |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2301.09410 |