Search results for "Dressed state"

showing 3 items of 3 documents

Atom-field dressed states in slow-light waveguide QED

2015

We discuss the properties of atom-photon bound states in waveguide QED systems consisting of single or multiple atoms coupled strongly to a finite-bandwidth photonic channel. Such bound states are formed by an atom and a localized photonic excitation and represent the continuum analog of the familiar dressed states in single-mode cavity QED. Here we present a detailed analysis of the linear and nonlinear spectral features associated with single- and multi-photon dressed states and show how the formation of bound states affects the waveguide-mediated dipole-dipole interactions between separated atoms. Our results provide a both qualitative and quantitative description of the essential strong…

---Waveguide (electromagnetism)Field (physics)FOS: Physical sciencesPhysics::OpticsSlow light01 natural sciences010305 fluids & plasmasdressed states.0103 physical sciencesAtomBound statePhysics::Atomic Physics010306 general physicsPhysicsQuantum Physicsbusiness.industryWaveguide QEDatom-photon bound statePhotonicsAtomic physicsQuantum Physics (quant-ph)businesscoupled-cavity arrayExcitationMicrowaveWaveguide QED; coupled-cavity arrays; atom-photon bound states; dressed states.
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Time-dependent Casimir-Polder forces and partially dressed states

2002

A time-dependent Casimir–Polder force is shown to arise during the time evolution of a partially dressed two-level atom. The partially dressed atom is obtained by a rapid change of an atomic parameter such as its transition frequency, due to the action of some external agent. The electromagnetic field fluctuations around the atom, averaged over the solid angle for simplicity, are calculated as a function of time, and it is shown that the interaction energy with a second atom yields a dynamical Casimir–Polder potential between the two atoms.

Electromagnetic fieldPhysicsCondensed Matter::Quantum GasesQuantum PhysicsTime evolutionSolid angleGeneral Physics and AstronomyFOS: Physical sciencesInteraction energyFunction (mathematics)dynamical Casimir interactionsAction (physics)Casimir effectPartially dressed stateAtomPhysics::Atomic and Molecular ClustersPhysics::Atomic PhysicsAtomic physicsQuantum Physics (quant-ph)
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Emission of real phonons due to electron's self-dressing in a covalent crystal

2011

A slow monoelectronic excitation in a covalent crystal at the temperature T=0 is analyzed. The interaction with zero-point longitudinal acoustic phonons leads to the formation of a dressed electronic state at an energy level lower than that of the initial bare state. This aspect of the dressing process is described here by hypothesizing that the excess of energy is released with the emission of real phonons. Specifically, this paper considers the transition probability from the bare monoelectronic state to a dressed state of the electron accompanied by real phonons and a deformation field. The spectrum of the real phonons emitted during the electronic self-dressing is calculated by applying…

Femtosecond phenomenaPhonon-electron interactionDressed stateSettore FIS/03 - Fisica Della Materia
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