Distance dependence of two-atom dipole interactions with one atom in an excited state

Milonni, Peter W.; Rafsanjani, Seyed Mohammad Hashemi

doi:10.1103/physreva.92.062711

Cited by 49 publications

(90 citation statements)

References 30 publications

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“…Another recent work finds that both forces can simultaneously arise in a single set-up: the vdW interaction on the excited atom oscillates, in agreement with [18,19,22], but the vdW force acting on the ground-state atom is monotonic [23]. This result would imply an apparent violation of the action-reaction principle in excited systems in free space.…”

Section: Arxiv:150300986v2 [Quant-ph] 23 Feb 2017mentioning

confidence: 82%

“…A very recent work claims that both results, the monotonic and the oscillating, are valid, but they describe different physical processes [22]: the oscillating result is related to a coherent exchange of excitation between the atoms, while the monotonic result is associated to a fast loss of excitation acquired from the initially excited atom. Another recent work finds that both forces can simultaneously arise in a single set-up: the vdW interaction on the excited atom oscillates, in agreement with [18,19,22], but the vdW force acting on the ground-state atom is monotonic [23].…”

Section: Arxiv:150300986v2 [Quant-ph] 23 Feb 2017mentioning

confidence: 99%

“…When both atoms are excited, the monotonic and oscillating results both contribute and can be attributed to different physical processes [22]: the oscillating result is related to a reversible exchange of excitation ("pendulation") and the monotonic form with an effectively irreversible (Forster) excitation transfer.…”

Section: Van Der Waals Interaction Between Two Excited Atomsmentioning

confidence: 99%

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van der Waals interactions between excited atoms in generic environments

et al. 2016

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We consider the the van der Waals force involving excited atoms in general environments, constituted by magnetodielectric bodies. We develop a dynamical approach studying the dynamics of the atoms and the field, mutually coupled. When only one atom is excited, our dynamical theory suggests that for large distances the van der Waals force acting on the ground-state atom is monotonic, while the force acting in the excited atom is spatially oscillating. We show how this latter force can be related to the known oscillating Casimir-Polder force on an excited atom near a (ground-state) body. Our force also reveals a population-induced dynamics: for times much larger that the atomic lifetime the atoms will decay to their ground-states leading to the van der Waals interaction between ground-state atoms.

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Section: Arxiv:150300986v2 [Quant-ph] 23 Feb 2017mentioning

confidence: 82%

Section: Arxiv:150300986v2 [Quant-ph] 23 Feb 2017mentioning

confidence: 99%

Section: Van Der Waals Interaction Between Two Excited Atomsmentioning

confidence: 99%

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van der Waals interactions between excited atoms in generic environments

et al. 2016

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“…The ensuing products in equation (1) can thus have inverse power distance dependences running up to 12 R  .…”

Section: A Fimentioning

confidence: 99%

“…In recent work 5 we have developed a framework of quantum electrodynamics (QED) 6,7 to address Raman scattering influenced by a second, neighboring molecule; this is one of many situations in which such a theory of fundamental coupling is applied. [8][9][10][11][12][13][14][15][16] Our interest is not only in the modification of line intensities (beyond the familiar heterogeneous spectral broadening): we have shown that it is possible to engender additional spectra lines that are not conventionally Raman active, identifying the constraints that apply. The symmetry aspects of the latter feature are the focus of the present work.…”

Section: Introductionmentioning

confidence: 99%

Symmetry analysis of Raman scattering mediated by neighboring molecules

Williams

Andrews

2016

The Journal of Chemical Physics

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Raman spectroscopy is a key technique for the identification and structural interrogation of molecules. It generally exploits changes in vibrational state within individual molecules which produce, in the scattered light, frequencies that are absent in the incident light. Considered as a quantum optical process, each Raman scattering event involves the concurrent annihilation and creation of photons of two differing radiation modes, accompanying vibrational excitation or decay. For molecules of sufficiently high symmetry, certain transitions may be forbidden by the two-photon selection rules, such that corresponding frequency shifts may not appear in the scattered light. By further developing the theory on a formal basis detailed in other recent work [J. Chem. Phys. 144, 174304 (2016)], the present analysis now addresses cases in which expected selection rule limitations are removed as a result of the electronic interactions between neighboring molecules. In consequence, new vibrational lines may appear -even some odd parity (ungerade) vibrations may then participate in the Raman process. Subtle differences arise according to whether the input and output photon events occur at either the same or different molecules, mediated by intermolecular interactions. For closely neighboring molecules, within near-field displacement distances, it emerges that the radiant intensity of Raman scattering can have various inverse-power dependences on separation distance. A focus is given here to the newly permitted symmetries, and the results include an extended list of irreducible representations for each point group in which such behavior can arise.

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Resonance Interaction Energy in κ‐Minkowski Spacetime

2023

Annalen der Physik

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If gravity is quantized, one of the consequences may be that the spacetime coordinates are quantized and become noncommutative. The κ‐Minkowski spacetime is such kind of noncommutative spacetime. In this paper, the resonance interaction energy of a two‐atom system coupled with a fluctuating vacuum scalar field in the κ‐Minkowski spacetime is studied. It is found that the resonance interaction energy is dependent on the interatomic separation, the transition wavelength of the atoms, and the spacetime non‐commutativity. When the interatomic separation is small compared with a characteristic length determined by the spacetime non‐commutativity parameter and the transition wavelength, the resonance interaction energy is that in the Minkowski spacetime plus a correction due to the spacetime non‐commutativity. When the interatomic separation is comparable to or larger than the characteristic length, the resonance interaction energy cannot be organized in the form of a Minkowski term plus a correction, which indicates that the long‐range behavior of the vacuum in the κ‐Minkowski spacetime is fundamentally different from that in the Minkowski spacetime.

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Distance dependence of two-atom dipole interactions with one atom in an excited state

Cited by 49 publications

References 30 publications

van der Waals interactions between excited atoms in generic environments

van der Waals interactions between excited atoms in generic environments

Symmetry analysis of Raman scattering mediated by neighboring molecules

Resonance Interaction Energy in κ‐Minkowski Spacetime

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