Temperature dependence of the magnetic Casimir-Polder interaction

Haakh, Harald R.; Intravaia, Francesco; Henkel, Carsten; Spagnolo, S.; Passante, Roberto; Power, Brian; Sols, Fernando

doi:10.1103/physreva.80.062905

Cited by 45 publications

(49 citation statements)

References 72 publications

(169 reference statements)

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“…Barton performed the generalization for the magnetic polarizability at finite temperature [17]. Haakh et al more recently discussed the magnetic Casimir-Polder interaction for real atoms [18]. The anisotropic case at zero temperature for the electrical CasimirPolder interaction was first given by Craig and Power [19,20].…”

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confidence: 99%

Negative Casimir entropies in nanoparticle interactions

Milton

Guérout

Ingold

et al. 2015

J. Phys.: Condens. Matter

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Negative entropy has been known in Casimir systems for some time. For example, it can occur between parallel metallic plates modeled by a realistic Drude permittivity. Less well known is that negative entropy can occur purely geometrically, say between a perfectly conducting sphere and a conducting plate. The latter effect is most pronounced in the dipole approximation, which is reliable when the size of the sphere is small compared to the separation between the sphere and the plate. Therefore, here we examine cases where negative entropy can occur between two electrically and magnetically polarizable nanoparticles or atoms, which need not be isotropic, and between such a small object and a conducting plate. Negative entropy can occur even between two perfectly conducting spheres, between two electrically polarizable nanoparticles if there is sufficient anisotropy, between a perfectly conducting sphere and a Drude sphere, and between a sufficiently anisotropic electrically polarizable nanoparticle and a transverse magnetic conducting plate.

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mentioning

confidence: 99%

Negative Casimir entropies in nanoparticle interactions

Milton

Guérout

Ingold

et al. 2015

J. Phys.: Condens. Matter

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“…This is because in this regime, the electromagnetic field, except very close to the reflected light cone, is mediated by propagating photonic modes with low frequency: for these modes the perfect reflector provides a reasonable boundary condition even for a real material. In fact, this can be shown directly for the Green's tensor at large distances above a general metal [45]. As shown in Fig.…”

Section: A Imaginary Frequency Representationmentioning

confidence: 72%

“…A conducting medium features additional diffusive lowfrequency excitations ('eddy currents') connected with branch-cut discontinuities along the negative imaginary axis. Since the latter have a minor impact in electricdipole coupling [45,48,49], we focus in the following on the surface excitations.…”

Section: B Surface-plasmon Contributionmentioning

confidence: 99%

Dynamical Casimir-Polder interaction between an atom and surface plasmons

et al. 2014

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We investigate the time-dependent Casimir-Polder potential of a polarizable two-level atom placed near a surface of arbitrary material, after a sudden change in the parameters of the system. Different initial conditions are taken into account. For an initially bare ground-state atom, the time-dependent Casimir-Polder energy reveals how the atom is "being dressed" by virtual, matter-assisted photons. We also study the transient behavior of the Casimir-Polder interaction between the atom and the surface starting from a partially dressed state, after an externally induced change in the atomic level structure or transition dipoles. The Heisenberg equations are solved through an iterative technique for both atomic and field operators in the medium-assisted electromagnetic field quantization scheme. We analyze in particular how the time evolution of the interaction energy depends on the optical properties of the surface, in particular on the dispersion relation of surface plasmon polaritons. The physical significance and the limits of validity of the obtained results are discussed in detail.PACS numbers: 34.35.+a -interactions of atoms with surfaces; 42.50.Nn -quantum optical phenomena in conducting media; 73.20.Mf -surface plasmons A striking feature of the quantum nature of the electromagnetic field is the existence of a vacuum energy and of zero-point fluctuations. Field fluctuations have observable effects such as the Lamb shift, spontaneous emission, Casimir-Polder forces, and the Casimir effect [1][2][3][4]. In particular, Casimir-Polder forces are long-range electromagnetic interactions between neutral polarizable atoms or molecules (van der Waals interaction), or between an atom and a macroscopic object, that arise from the zero-point fluctuations of the electromagnetic field and matter [5][6][7]. Their prediction is arguably one of the most important results of quantum electrodynamics. The macroscopic counterpart of the Casimir-Polder forces is the Casimir effect, predicting an attractive force between two parallel uncharged plates [8]. The relation between the Casimir effect and Casimir-Polder forces has been extensively investigated in the literature, highlighting fundamental properties such as the nonadditivity [1, 9] and fluctuations (see Ref.[10] and references therein). Experiments conducted from the second half of the nineties to now, have incontrovertibly shown the reality of these rather counterintuitive effects [3,4,11,12]. It is now recognized that the Casimir effect plays an important role in the operation of micro-and nano-electromechanical devices (MEMS and NEMS) [3,4,13]. In particular, the research of experimental setups that allow for a modulation of the intensity or the sign of the force is of great interest as it may help to prevent the jamming ('stiction') of such machinery due to attractive forces, leading to the * Electronic address: harald.haakh@mpl.mpg.de breakdown of the device. In the field of miniaturized atom traps, the control over the Casimir-Polder attraction is desirable to ach...

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“…The expression for the dressed polarizability was derived in the previous section while the one forĜ χ can be easily found in literature for simple geometries like a half-space (see for example [52,62,63]). If we perform a series expansion the logarithm in Eq.…”

Section: Casimir-polder Interactionmentioning

confidence: 99%

Casimir effect as a sum over modes in dissipative systems

Intravaia

Behunin

2012

Phys. Rev. A

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The aim of this paper is to show that within the open-system framework the sum-over-modes approachá la Casimir [1] leads to the Lifshitz formula for the Casimir free energy. A general result applicable to arbitrary geometries is obtained through the use of Ford, Lewis, & O'Connell's remarkable formula [2,3]. Additionally, we address the possibility for obtaining the Casimir energy as a sum over complex "modes". We show in this case that the standard sum-over-modes formula must be suitably generalized to avert unphysical complex energies. Finally, we apply our results to several standard examples.

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Temperature dependence of the magnetic Casimir-Polder interaction

Cited by 45 publications

References 72 publications

Negative Casimir entropies in nanoparticle interactions

Negative Casimir entropies in nanoparticle interactions

Dynamical Casimir-Polder interaction between an atom and surface plasmons

Casimir effect as a sum over modes in dissipative systems

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