Abstract
We demonstrate that a ionising transition can be strongly coupled to a photonic resonance. The strong coupling manifests itself with the appearance of a narrow optically active resonance below the ionisation threshold. Such a resonance is due to electrons transitioning into a novel bound state created by the collective coupling of the electron gas with the vacuum field of the photonic resonator. 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 knob to tune both optical and electronic properties of semiconductor heterostructures.
Highlights
When a single photon can be trapped in an optical resonator long enough to undergo multiple absorption and re-emission cycles, the coupled light–matter system is said to be in the strong coupling regime
In this work we demonstrated that an ionizing electronic transition can be strongly coupled to a photonic resonator
An interesting alternative that can open up vaster perspectives in the long term is to develop quantum-well (QWIP) or quantum cascade (QCD) intersubband detectors operating in strong coupling
Summary
When a single photon can be trapped in an optical resonator long enough to undergo multiple absorption and re-emission cycles, the coupled light–matter system is said to be in the strong coupling regime. In this work we demonstrate that ionizing electronic transitions can be strongly coupled to a photonic resonator, leading to the appearance of discrete polaritonic resonances below the ionization threshold. Notwithstanding the above, we will consider the specific case of microcavityembedded doped quantum wells, sketched, which have an immediate technological relevance while allowing for a simpler and more transparent theoretical treatment thanks to their effective one-dimensional nature. In those systems the confinement along the growth (z) axis splits the conduction band into multiple discrete bound or continuous unbound subbands. Bound-tocontinuum transitions in doped quantum wells have been the object of theoretical [39] and experimental [40] investigations
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