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Quantum theory of intersubband polarons

Abstract : We present a microscopic quantum theory of intersubband polarons, quasiparticles originated from the coupling between intersubband transitions and longitudinal optical phonons. To this aim we develop a second quantized theory taking into account the Fröhlich interaction between phonons and intersubband transitions and the Coulomb interaction between the intersubband transitions themselves. Our results show that the coupling between the phonons and the intersubband transitions is extremely intense, thanks both to the collective nature of the intersubband excitation and to the natural tight confinement of optical phonons. Not only the coupling is strong enough to spectroscopically resolve the resonant splitting between the modes (strong coupling regime), but it can become comparable to the bare frequency of the excitations (ultrastrong coupling regime). We thus predict the possibility to exploit intersubband polarons both for applied optoelectronic research, where a precise control of the phonon resonances is needed, and also to observe fundamental quantum vacuum physics, typical of the ultrastrong coupling regime.
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Contributor : Cristiano Ciuti Connect in order to contact the contributor
Submitted on : Thursday, November 24, 2011 - 5:27:44 PM
Last modification on : Saturday, June 25, 2022 - 8:51:15 PM
Long-term archiving on: : Saturday, February 25, 2012 - 2:30:07 AM


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  • HAL Id : hal-00644634, version 1
  • ARXIV : 1111.5916



Simone de Liberato, Cristiano Ciuti. Quantum theory of intersubband polarons. 2011. ⟨hal-00644634⟩



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