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Light-matter excitations in the ultra-strong coupling regime

Abstract : In a microcavity, light-matter coupling is quantified by the vacuum Rabi frequency $\Omega_R$. When $\Omega_R$ is larger than radiative and non-radiative loss rates, the system eigenstates (polaritons) are linear superposition of photonic and electronic excitations, a condition actively investigated in diverse physical implementations. Recently, a quantum electrodynamic regime (ultra-strong coupling) was predicted when $\Omega_R$ becomes comparable to the transition frequency. Here we report unambiguous signatures of this regime in a quantum-well intersubband microcavity. Measuring the cavity-polariton dispersion in a room-temperature linear optical experiment, we directly observe the anti-resonant light-matter coupling and the photon-energy renormalization of the vacuum field.
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Contributor : Cristiano Ciuti Connect in order to contact the contributor
Submitted on : Tuesday, March 10, 2009 - 2:16:24 PM
Last modification on : Wednesday, August 31, 2022 - 4:46:23 PM
Long-term archiving on: : Thursday, September 23, 2010 - 5:11:00 PM


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  • HAL Id : hal-00315208, version 3
  • ARXIV : 0808.3720


Aji A. Anappara, Simone de Liberato, Alessandro Tredicucci, Cristiano Ciuti, Giorgio Biasiol, et al.. Light-matter excitations in the ultra-strong coupling regime. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2009, 79, pp.201303. ⟨hal-00315208v3⟩



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