Ford and Svaiter Reply:

Ford, L. H.; Svaiter, N. F.

doi:10.1103/physrevlett.106.038902

Cited by 34 publications

(91 citation statements)

References 4 publications

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“…However, this effect is generally too small to be observed. Recently, Ford et al proposed that a nonlinear medium with a fluctuating background field may be considered as an analogue system for quantum lightcone fluctuations [14,15]. In a nonlinear medium, the effective refractive index for a probe light is fluctuating when the medium is subjected to a fluctuating background field, which leads to a fluctuating flight time.…”

Section: Introductionmentioning

confidence: 99%

“…This is in close analogy to the lightcone fluctuation due to metric fluctuations when gravity is quantized. Besides the analogue models for active gravitational field fluctuations, which are analogous to the fluctuations of the dynamical degrees of freedom of gravity itself [14,15], there are also analogue models for passive fluctuations of gravity driven by the fluctuations of matter fields [16,17]. The fluctuating background field can be either a squeezed vacuum [14,16], or a bath of fluctuating electromagnetic fields in vacuum [15,17].…”

Section: Introductionmentioning

confidence: 99%

“…Besides the analogue models for active gravitational field fluctuations, which are analogous to the fluctuations of the dynamical degrees of freedom of gravity itself [14,15], there are also analogue models for passive fluctuations of gravity driven by the fluctuations of matter fields [16,17]. The fluctuating background field can be either a squeezed vacuum [14,16], or a bath of fluctuating electromagnetic fields in vacuum [15,17]. Apart from being an analogue model for quantum gravity, the work [15,17] also provides a model to show that vacuum fluctuations sampled in a finite time scale are potentially observable.…”

Section: Introductionmentioning

confidence: 99%

“…The paper is organized as follows: In Sec. II, we briefly introduce the basic formalism of quantum lightcone fluctuations in a nonlinear medium [14,15]. In Secs.…”

Section: Introductionmentioning

confidence: 99%

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Lightcone fluctuations in a nonlinear medium due to thermal fluctuations

2019

Phys. Rev. D

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We study the flight time fluctuations of a probe light propagating in a slab of nonlinear optical material with an effective fluctuating refractive index caused by thermal fluctuations of background photons at a temperature T , which are analogous to the lightcone fluctuations due to fluctuating spacetime geometry when gravity is quantized. A smoothly varying second order susceptibility is introduced, which results in that background field modes whose wavelengths are of the order of the thickness of the slab give the main contribution. We show that, in the low-temperature limit, the contribution of thermal fluctuations to the flight time fluctuations is proportional to T 4 , which is a small correction compared with the contributions from vacuum fluctuations, while in the high-temperature limit, the contribution of thermal fluctuations increases linearly with T , which dominates over that of vacuum fluctuations. Numerical estimation shows that, in realistic situations, the contributions from thermal fluctuations are still small compared with that from vacuum fluctuations even at room temperature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The paper is organized as follows: In Sec. II, we briefly introduce the basic formalism of quantum lightcone fluctuations in a nonlinear medium [14,15]. In Secs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lightcone fluctuations in a nonlinear medium due to thermal fluctuations

2019

Phys. Rev. D

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“…The contributions of different ranges of frequency almost, but not quite, cancel out one another, and there is the possibility of enhancing the magnitude of the effect by altering the reflectivity of the boundary in selected frequency ranges. A quite different mechanism for amplification of vacuum fluctuations was proposed by Ford and Svaiter [62] [63] using parabolic mirrors to produce large vacuum fluctuations near mirror's focus. These authors studied the renormalized vacuum fluctuations associated with a scalar and electromagnetic field near the focus of a parabolic mirror.…”

Section: Discussionmentioning

confidence: 99%

Virtual processes and super-radiance in spin-boson models

Alcalde

Kullock

Svaiter

2009

Journal of Mathematical Physics

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We consider spin-boson models composed by a single bosonic mode and an ensemble of N identical two-level atoms. The situation where the coupling between the bosonic mode and the atoms generates real and virtual processes is studied, where the whole system is in thermal equilibrium with a reservoir at temperature β −1 . Phase transitions from ordinary fluorescence to superradiant phase in three different models is investigated. First a model where the coupling between the bosonic mode and the j − th atom is via the pseudo-spin operator σ z (j) is studied. Second, we investigate the generalized Dicke model, introducing different coupling constants between the single mode bosonic field and the environment, g 1 and g 2 for rotating and counter-rotating terms, respectively. Finally it is considered a modified version of the generalized Dicke model with intensity-dependent coupling in the rotating terms. In the first model the zero mode contributes to render the canonical entropy a negative quantity for low temperatures. The last two models presents phase transitions, even when only Hamiltonian terms which generates virtual processes are considered.

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Tailoring Optical Properties of Luminescent Semiconducting Nanocrystals through Hydrostatic, Anisotropic Static, and Dynamic Pressures

et al. 2021

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Studies on the hydrostatic-pressure-dependent optical properties of av ariety of metal-halide perovskites will be discussed below.M etal-halide perovskites (MHPs), which have the general formula ABX 3 [A = Cs + ,C H 3 NH 3 + (methylammonium, MA), HC(NH 3 ) 2 2+ (formamidinium, FA), etc.; B = Pb 2+ ,S n 2+ ,e tc.; and X = Cl, Br, or I],h ave been widely studied because of their tremendous potential for use in many optoelectronic applications,i ncluding solar cells, [18][19][20][21] LEDs, [22][23][24][25][26] photodetectors, [27,28] and scintillators. [29] Thee xceptional optical performance of MHPs can be attributed to their strong optical absorption, [30,31] low exciton binding energy, [32] long exciton diffusion lengths, [33] high carrier mobility, [34,35] defect tolerance, [36][37][38] and facile synthesis. [35,39] Lead-halide perovskites (LHPs) are ac lass of MHPs that have shown great promise as aresult of the abovementioned unique properties and their relatively high stability. [40] LHP NCs are of particular interest because of their extremely bright and narrow photoluminescence (PL) band and the ease of tuning their emission wavelengths by tuning both the halide composition and the size of the NCs. [41][42][43][44][45][46][47] Thef ollowing subsections will outline how the application of hydrostatic pressure alters the optical properties of avariety of LHP NCs. All-Inorganic CsPbX 3 PerovskitesCs + is acommonly used A-site cation in all-inorganic LHP NCs because its large ionic radius (R A = 1.88 )a llows the formation of astable perovskite phase,asdetermined by the Goldschmidt tolerance factor. [48] CsPbBr 3 NCs have been shown to possess an ear-unity photoluminescence quantum yield (PLQY), narrow (i.e.8 6meV) full width at half max (FWHM), and superior stability to both CsPbI 3 and CsPbCl 3 . [49,50] When subjected to hydrostatic pressures up to about 1.4 GPa, the PL spectra of CsPbBr 3 NCs was redshifted, widened, and decreased in intensity until ca. 1.3 GPa, at which pressure the PL was sharply quenched (Figure 1). [51] Thea uthors attributed the discontinuity to an isostructural phase transformation of the Pbnm space group. [51] Firstprinciple calculations suggested that the shift in the emission and the phase change were due to pressure-induced variations of the BrÀPb bond lengths and shrinkage of the Pb-Br-Pb bond angles within the lead bromide octahedra. [51] Interest-Angewandte Chemie Kurzaufsätze 9858 www.angewandte.de

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Ford and Svaiter Reply:

Cited by 34 publications

References 4 publications

Lightcone fluctuations in a nonlinear medium due to thermal fluctuations

Lightcone fluctuations in a nonlinear medium due to thermal fluctuations

Virtual processes and super-radiance in spin-boson models

Tailoring Optical Properties of Luminescent Semiconducting Nanocrystals through Hydrostatic, Anisotropic Static, and Dynamic Pressures

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