0000000000173018

AUTHOR

Ruggero Vasile

showing 6 related works from this author

Dynamical Casimir-Polder force between an atom and a conducting wall

2008

The time-dependent Casimir-Polder force arising during the time evolution of an initially bare two-level atom, interacting with the radiation field and placed near a perfectly conducting wall, is considered. Initially the electromagnetic field is supposed to be in the vacuum state and the atom in its ground state. The analytical expression of the force as a function of time and atom-wall distance, is evaluated from the the time-dependent atom-field interaction energy. Physical features and limits of validity of the results are discussed in detail.

Electromagnetic fieldPhysicsQuantum PhysicsForce field (physics)quantum fluctuationsVacuum stateTime evolutionFOS: Physical sciencesInteraction energyquantum electrodynamicCasimir-Polder forceAtomic and Molecular Physics and OpticsCasimir effectClassical mechanicsAtomPhysics::Atomic and Molecular ClustersPhysics::Atomic PhysicsGround stateQuantum Physics (quant-ph)
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Casimir-Polder forces, boundary conditions and fluctuations

2008

We review different aspects of the atom-atom and atom-wall Casimir-Polder forces. We first discuss the role of a boundary condition on the interatomic Casimir-Polder potential between two ground-state atoms, and give a physically transparent interpretation of the results in terms of vacuum fluctuations and image atomic dipoles. We then discuss the known atom-wall Casimir-Polder force for ground- and excited-state atoms, using a different method which is also suited for extension to time-dependent situations. Finally, we consider the fluctuation of the Casimir-Polder force between a ground-state atom and a conducting wall, and discuss possible observation of this force fluctuation.

Statistics and ProbabilityPhysicsCondensed Matter::Quantum GasesQuantum PhysicsGeneral Physics and AstronomyFOS: Physical sciencesStatistical and Nonlinear PhysicsInteratomic potentialInterpretation (model theory)Condensed Matter - Other Condensed MatterCasimir effectDipoleClassical mechanicsModeling and SimulationExcited stateAtomPhysics::Atomic and Molecular ClustersCasimir-Polder forcesBoundary value problemPhysics::Atomic PhysicsQuantum Physics (quant-ph)Mathematical PhysicsQuantum fluctuationOther Condensed Matter (cond-mat.other)
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Dynamical Casimir-Polder force between an excited atom and a conducting wall

2016

We consider the dynamical atom-surface Casimir-Polder force in the non-equilibrium configuration of an atom near a perfectly conducting wall, initially prepared in an excited state with the field in its vacuum state. We evaluate the time-dependent Casimir-Polder force on the atom, and find that it shows an oscillatory behavior from attractive to repulsive both in time and in space. We also investigate the asymptotic behavior in time of the dynamical force and of related local field quantities, showing that the static value of the force, as obtained by a time-independent approach, is recovered for times much larger than the timescale of the atomic self-dressing, but smaller than the atomic d…

General PhysicsField (physics)Vacuum stateNon-equilibrium thermodynamicsFOS: Physical sciences7. Clean energy01 natural sciencesquant-phQuantum mechanics0103 physical sciencesAtomPhysics::Atomic and Molecular ClustersPhysics::Atomic Physics010306 general physicsLocal field01 Mathematical SciencesPhysicsdispersion interactionsCondensed Matter::Quantum GasesQuantum Physics02 Physical Sciences010308 nuclear & particles physicsDynamical Casimir effectCasimir effectPotsdam Transfer - Zentrum für Gründung Innovation Wissens- und TechnologietransferExcited stateAtomic physics03 Chemical SciencesQuantum Physics (quant-ph)Radioactive decay
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Dynamical Casimir-Polder force on a partially dressed atom near a conducting wall

2010

We study the time evolution of the Casimir-Polder force acting on a neutral atom in front of a perfectly conducting plate, when the system starts its unitary evolution from a partially dressed state. We solve the Heisenberg equations for both atomic and field quantum operators, exploiting a series expansion with respect to the electric charge and an iterative technique. After discussing the behaviour of the time-dependent force on an initially partially-dressed atom, we analyze a possible experimental scheme to prepare the partially dressed state and the observability of this new dynamical effect.

Quantum electrodynamicsPhysicsCondensed Matter::Quantum GasesQuantum PhysicsField (physics)Dynamical Casimir effectTime evolutionFOS: Physical sciencesCasimir-Polder forceElectric chargeAtomic and Molecular Physics and OpticsMathematical OperatorsCasimir effectClassical mechanicsQuantum mechanicsAtomPhysics::Atomic Physics[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]Series expansionQuantum Physics (quant-ph)Heisenberg picture
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Dynamical Casimir-Polder potentials in non-adiabatic conditions

2014

In this paper we review different aspects of the dynamical Casimir¿Polder potential between a neutral atom and a perfectly conducting plate under nonequilibrium conditions. In order to calculate the time evolution of the atom¿wall Casimir¿Polder potential, we solve the Heisenberg equations describing the dynamics of the coupled system using an iterative technique. Different nonequilibrium initial states are considered, such as bare and partially dressed states. The partially dressed states considered are obtained by a sudden change of a physical parameter of the atom or of its position relative to the conducting plate. Experimental feasibility of detecting the considered dynamical effects i…

PhysicsQuantum PhysicsEnergetic neutral atomDynamical Casimir effectTime evolutionFOS: Physical sciencesNon-equilibrium thermodynamicsCondensed Matter PhysicsAtomic and Molecular Physics and OpticsCasimir effectClassical mechanicsPosition (vector)Casimir–Polder ForcesDynamical Casimir–Polder interactionsPhysics::Atomic and Molecular ClustersPhysics::Atomic PhysicsQuantum Physics (quant-ph)Casimir–Polder Forces dynamical Casimir effect dynamical Casimir–Polder interactionsAdiabatic processMathematical Physics
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Time-dependent Maxwell field operators and field energy density for an atom near a conducting wall

2009

We consider the time evolution of the electric and magnetic field operators for a two-level atom, interacting with the electromagnetic field, placed near an infinite perfectly conducting wall. We solve iteratively the Heisenberg equations for the field operators and obtain the electric and magnetic energy density operators around the atom (valid for any initial state). Then we explicitly evaluate them for an initial state with the atom in its bare ground state and the field in the vacuum state. We show that the results can be physically interpreted as the superposition of the fields propagating directly from the atom and the fields reflected on the wall. Relativistic causality in the field …

Electromagnetic fieldPhysicsvacuum fluctuationQuantum PhysicsMagnetic energyField (physics)Vacuum stateFOS: Physical sciencesOptical fieldAtomic and Molecular Physics and OpticsMagnetic fieldQuantum electrodynamicQuantum mechanicsQuantum electrodynamicsPhysics::Atomic and Molecular ClustersBoundary value problemCasimir-Polder forcesGround stateQuantum Physics (quant-ph)
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