Localization and spectrum of quasiparticles in a disordered fermionic Dicke model
arXiv:2305.01664 · doi:10.1103/PhysRevB.108.184206
Abstract
We study a fermionic two-band model with the interband transition resonantly coupled to a cavity. This model was recently proposed to explain cavity-enhanced charge transport, but a thorough characterization of the closed system, in particular localization of various excitations, is lacking. In this work, using exact diagonalization, we characterize the system by its spectrum under various filling factors and variable disorder. As in the Dicke model, the effective light-matter coupling scales with the square root of the system size. However, there is an additional factor that decreases with increasing doping density. The transition from the weak-coupling regime to the strong-coupling regime occurs when the effective light-matter coupling is larger than the electronic bandwidth. Here, the formation of exciton-polaritons is accompanied by the formation of bound excitons. Photon spectral functions exhibit significant weights on the in-gap states between the polaritons, even without disorder. Finally, while the localization of electron-hole excitations in a disordered system is lifted by strong coupling, the same is not true for free charges, which remain localized at strong and even ultrastrong coupling. Based on this finding, we discuss scenarios for charge transport.
References in corpus (34)
- Circuit Quantum Electrodynamics
- Strong coupling between surface plasmon polaritons and emitters
- Quantum Plasmonics
- Ultrastrong coupling between light and matter
- Exciton-polariton condensates
- Quantum vacuum properties of the intersubband cavity polariton field
- Conductivity in organic semiconductors hybridized with the vacuum field
- Cavity-controlled chemistry in molecular ensembles
- Extraordinary exciton conductance induced by strong coupling
- Suppressing photochemical reactions with quantized light fields
- Is there a no-go theorem for superradiant quantum phase transitions in cavity and circuit QED ?
- Cavity enhanced transport of excitons
- Molecular polaritons for controlling chemistry with quantum optics
- Superabsorption in an organic microcavity: towards a quantum battery
- Exciton-polariton mediated superconductivity
- Cavity-enhanced transport of charge
- Transient localization in crystalline organic semiconductors
- Collective coherence in planar semiconductor microcavities
- Cavity quantum electrodynamics in the non-perturbative regime
- Generalized Inverse Participation Ratio as a Possible Measure of Localization for Interacting Systems
- Dark state semilocalization of quantum emitters in a cavity
- A General Charge Transport Picture for Organic Semiconductors with Nonlocal Electron-Phonon Couplings
- Disorder-Enhanced and Disorder-Independent Transport with Long-Range Hopping: Application to Molecular Chains in Optical Cavities
- Unusual Dynamical Properties of Disordered Polaritons in Micocavities
- Cavity-assisted mesoscopic transport of fermions: Coherent and dissipative dynamics
- Molding Molecular and Material Properties by Strong Light-Matter Coupling
- Vacuum-dressed cavity magnetotransport of a 2D electron gas
- Thermodynamics of ultrastrongly coupled light-matter systems
- Energy transfer and correlations in cavity-embedded donor-acceptor configurations
- A quantum optics approach to photoinduced electron transfer in cavities
- Molecular polaritonics in dense mesoscopic disordered ensembles
- Multielectron Ground State Electroluminescence
- Dark vertical conductance of cavity-embedded semiconductor heterostructures
- Incoherent charge transport in an organic polariton condensate