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Conference on Lasers and Electro-Optics

Oservation of bound excitons stabilised by the interaction with a photonic resonator

Erika Cortese, Ngoc-Linh Tran, Jean‐Michel Manceau, Adel Bousseksou, Iacopo Carusotto, G. Biasiol, R. Colombelli, Simone De Liberato

Published Jan 1, 2021• 0 citations
Publisher

Abstract

We demonstrate that, in cavity-embedded doped quantum wells, strong light-matter interaction can create a bound excitonic state. Such a cavity-stabilised state is spectroscopically observed as a discrete resonance below the ionisation threshold.
DOI
10.1364/cleo_qels.2021.ftu1o.1

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We demonstrate that a ionising transition can be strongly coupled to a photonic resonator, leading to the appearance of a discrete optically active polaritonic resonance below the ionisation threshold. The matter component of such hybrid excitation corresponds to a bound exciton created by light-matter interaction. Applying our theory to the case of bound-to-continuum transitions in microcavity-embedded doped quantum wells, we show how those strong-coupling features can be exploited as a novel gauge to tune both optical and electronic properties of semiconductor heterostructures.
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We investigate a ionising electronic transition under resonant pumping. We demonstrate that, above a critical value of the pump intensity, a novel metastable electronic bound state is created, which can decay into the free electron continuum by two-photon ionization. We calculate the system's resonant fluorescence spectrum, finding results qualitatively different from the Mollow triplet expected in a bound-to-bound transition. The fluorescent emission can be used to measure the time-resolved population of the novel metastable state. Contrary to Kramers-Hennenberger atoms, stabilised by non-perturbative, non-resonant laser pulses, the physics we observe is inherently resonant and relies on perturbative level repulsion. In analogy to how the AC-Stark shift is a semiclassical version of the single-photon Rabi splitting observed in photonic cavity, the phenomenon we describe is better understood as a semiclassical version of recently observed excitons bound by a single cavity photon. Our results demonstrate a novel way to stabilise electronic states with intense laser fields, increasing our capability to design and engineer non-classical states of matter.