Time resolved multi-photon effects in the fluorescence spectra of two-level systems at rest and in motion
arXiv:2006.11673 · doi:10.1103/PhysRevA.102.013719
Abstract
We study the time-resolved fluorescence spectrum in two-level systems interacting with an incident coherent field, both in the weak and intermediate coupling regimes. For a single two-level system in the intermediate coupling case, as time flows, the spectrum develops distinct features, that are not captured by a semi-classical treatment of the incident field. Specifically, for a field on resonance with the atomic transition energy, the usual Mollow spectrum is replaced by a four peak structure, and for a frequency that is half of the atomic transition energy, the time-dependent spectrum develops a second harmonic peak with a superimposed Mollow triplet. In the long-time limit, our description recovers results previously found in the literature. After analyzing why a different behavior is observed in the quantum and classical dynamics, the reason for the occurrence of a second harmonic signal in a two-level system is explained via a symmetry analysis of the total (electron and photon) system, and in terms of a three level system operating in limiting regimes. We find an increased second harmonic signal in an array of two-level systems, suggesting a superradiance-like enhancement for multiple two-level systems in cavity setups. Finally, initial explorative results are presented for two-level model atoms entering and exiting a cavity, which hint at an interesting interplay between cavity-photon screening and atomic dynamics effects.
arXiv comment19 pages, 11 figures. To be published in Phys. Rev. A
References in corpus (20)
- Ultrastrong coupling between light and matter
- Quantum jumps of light recording the birth and death of a photon in a cavity
- Progressive field-state collapse and quantum non-demolition photon counting
- Photon Blockade in the Ultrastrong Coupling Regime
- Adiabatic Elimination in a Lambda System
- The quantum Rabi model: solution and dynamics
- Perfect excitation of a matter qubit by a single photon in free space
- Suppression of the radiative decay of atomic coherence in squeezed vacuum
- Theory of frequency-filtered and time-resolved N-photon correlations
- Semi-classical and quantum Rabi models: in celebration of 80 years
- Enhancing Acceleration Radiation from Ground-State Atoms via Cavity Quantum Electrodynamics
- A generalization of the quantum Rabi model: exact solution and spectral structure
- Exact real-time dynamics of the quantum Rabi model
- Free-Space Quantum Electrodynamics with a single Rydberg superatom
- Dynamical correlation functions and the quantum Rabi model
- Some Exact Properties of the Nonequilibrium Response Function for Transient Photoabsorption
- Quantum Rabi Model with Two-Photon Relaxation
- Time-dependent nonlinear Jaynes-Cummings dynamics of a trapped ion
- Time-resolved spectroscopy at surfaces and adsorbate dynamics: insights from a model-system approach
- Nonequilibrium Green's functions and atom-surface dynamics: Simple views from a simple model system