Search results for "Dispersion forces"

showing 3 items of 3 documents

Causality, non-locality and three-body Casimir–Polder energy between three ground-state atoms

2006

The problem of relativistic causality in the time-dependent three-body Casimir–Polder interaction energy between three atoms, initially in their bare ground-state, is discussed. It is shown that the non-locality of the spatial correlations of the electromagnetic field emitted by the atoms during their dynamical self-dressing may become manifest in the dynamical three-body Casimir–Polder interaction energy between the three atoms.

Condensed Matter::Quantum GasesElectromagnetic fieldPhysicsQuantum opticsThree-body dispersion forces.Interaction energyCondensed Matter PhysicsThree-body problemAtomic and Molecular Physics and OpticsMany-body problemCausality (physics)Casimir effectQuantum electrodynamicQuantum mechanicsCausality and non-localityPhysics::Atomic and Molecular ClustersPhysics::Atomic PhysicsGround stateJournal of Physics B: Atomic, Molecular and Optical Physics
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Temperature dependence of the magnetic Casimir-Polder interaction

2009

We analyze the magnetic dipole contribution to atom-surface dispersion forces. Unlike its electrical counterpart, it involves small transition frequencies that are comparable to thermal energy scales. A significant temperature dependence is found near surfaces with a nonzero DC conductivity, leading to a strong suppression of the dispersion force at T > 0. We use thermal response theory for the surface material and discuss both normal metals and superconductors. The asymptotes of the free energy of interaction and of the entropy are calculated analytically over a large range of distances. Near a superconductor, the onset of dissipation at the phase transition strongly changes the interac…

SuperconductivityPhysicsQuantum PhysicsPhase transitionMagnetic momentCondensed matter physicsFOS: Physical sciencesDissipationLondon dispersion forceAtomic and Molecular Physics and OpticsCondensed Matter - Other Condensed MatterCasimir effectDipoleCasimir-Polder force Casimir effect dispersion forcesQuantum Physics (quant-ph)Magnetic dipoleOther Condensed Matter (cond-mat.other)Physical Review A
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DLPNO-CCSD(T) scaled methods for the accurate treatment of large supramolecular complexes

2017

In this work, we present scaled variants of the DLPNO-CCSD(T) method, dubbed as (LS)DLPNO-CCSD(T) and (NS)DLPNO-CCSD(T), to obtain accurate interaction energies in supramolecular complexes governed by noncovalent interactions. The novel scaled schemes are based on the linear combination of the DLPNO-CCSD(T) correlation energies calculated with the standard (LoosePNO and NormalPNO) and modified (Loose2PNO and Normal2PNO) DLPNO-CCSD(T) accuracy levels. The scaled DLPNO-CCSD(T) variants provide nearly TightPNO accuracy, which is essential for the quantification of weak noncovalent interactions, with a noticeable saving in computational cost. Importantly, the accuracy of the proposed schemes is…

chemistry.chemical_classificationFullerene010304 chemical physicsDispersion forcesNoncovalent interactionsSupramolecular chemistryGeneral Chemistry010402 general chemistry01 natural sciencesLondon dispersion force0104 chemical sciencesComputational MathematicsCrystallographychemistryComputational chemistryAb initio quantum chemistry methods0103 physical sciencesNon-covalent interactionsDLPNO-CCSD(T) scaled methodsDonor–acceptor supramolecular complexesAb initio calculationsQuímica FísicaLinear combination
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