S. D. Liberato

Publications88
h-index21
Citations1,882
Highly Influential Citations32
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Sub-cycle switch-on of ultrastrong light–matter interaction
TLDR
This work uses a quantum-well waveguide structure to optically tune light–matter interaction from weak to ultrastrong and turn on maximum coupling within less than one cycle of light, and directly monitors how a coherent photon population converts to cavity polaritons during abrupt switching.
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Breakdown of gauge invariance in ultrastrong-coupling cavity QED
We revisit the derivation of Rabi- and Dicke-type models, which are commonly used for the study of quantum light-matter interactions in cavity and circuit QED. We demonstrate that the validity of the…
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Signatures of the ultrastrong light-matter coupling regime
In a microcavity, light-matter coupling is quantified by the vacuum-Rabi frequency ?R. When ?R is larger than radiative and nonradiative loss rates, the system eigenstates (polaritons) are linear…
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Ultrastrong coupling between a cavity resonator and the cyclotron transition of a two-dimensional electron gas in the case of an integer filling factor
We investigate theoretically the coupling between a cavity resonator and the cyclotron transition of a two-dimensional electron gas under an applied perpendicular magnetic field. We derive and…
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Light-matter decoupling in the deep strong coupling regime: the breakdown of the Purcell effect.
Improvements in both the photonic confinement and the emitter design have led to a steady increase in the strength of the light-matter coupling in cavity quantum electrodynamics experiments. This has…
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Quantum theory of intersubband polarons
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…
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Virtual photons in the ground state of a dissipative system
Much of the novel physics predicted to be observable in the ultrastrong light–matter coupling regime rests on the hybridisation between states with different numbers of excitations, leading to a…
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Open quantum systems with local and collective incoherent processes: Efficient numerical simulations using permutational invariance
The permutational invariance of identical two-level systems allows for an exponential reduction in the computational resources required to study the Lindblad dynamics of coupled spin-boson ensembles…
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Terahertz lasing from intersubband polariton-polariton scattering in asymmetric quantum wells
Electric dipole transitions between different cavity polariton branches or between dressed atomic states with the same excitation number are strictly forbidden in centro-symmetric systems. For doped…
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Ultrastrong light-matter coupling at terahertz frequencies with split ring resonators and inter-Landau level transitions
We study strong light-matter coupling at terahertz frequencies employing a system based on an array of deeply subwavelength split ring resonators deposited on top of an ensemble of modulation-doped…
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