Ballistic Phonon Imaging in Solids—A New Look at Phonon Focusing

Northrop, G. A.; Wolfe, J. P.

doi:10.1103/physrevlett.43.1424

Cited by 97 publications

(34 citation statements)

References 8 publications

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“…It can be seen that the simulation reproduces the caustic features observed by experiment. The additional features shown in the simulated caustic are predicted to exist in the experimental system as well [8], however, it seems that their intensity was too low to be observed.…”

Section: Validating the Geant4 Implementationmentioning

confidence: 84%

“…1 shows an observed intensity pattern in Ge reported by Nothrop and Wolfe [8]. The left-hand panel shows an intensity pattern generated using the Geant4 phonon transport code.…”

Section: Validating the Geant4 Implementationmentioning

confidence: 86%

“…Phonons are focussed along preferred directions of propagation in the crystal. This effect is known as "Phonon focusing" and discussed in great detail by Wolfe [12] and Nothrop and Wolfe [8]. 2.…”

Section: Longitudinal (L) Fast Transverse (Ft) and Slow Transverse mentioning

confidence: 99%

“…Nothrop and Wolfe have initiated a heat pulse on one face of a small (1 cm 3 ) Ge crystal using a pulsed Nd:YAG laser and recorded a timing histogram of the phonon flux incident on the opposite crystal face using a cryogenic bolometer [8]. An identical setup has been modeled using the Geant4 phonon transport code.…”

Section: Validating the Geant4 Implementationmentioning

confidence: 99%

“…Phonon transport is highly anisotropic [7,8] and the spontaneous decay of high energy into low energy phonons leads to a rapidly evolving characteristic mean free path of the phonon system. The propagation behaviour of the downconverting phonons changes from diffuse scattering, with mean free paths of order microns, to the ballistic regime, with mean free paths comparable to the crystal dimension [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Monte Carlo Simulation of Massive Absorbers for Cryogenic Calorimeters

et al. 2012

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There is a growing interest in cryogenic calorimeters with macroscopic absorbers for applications such as dark matter direct detection and rare event search experiments. The physics of energy transport in calorimeters with absorber masses exceeding several grams is made complex by the anisotropic nature of the absorber crystals as well as the changing mean free paths as phonons decay to progressively lower energies. We present a Monte Carlo model capable of simulating anisotropic phonon transport in cryogenic crystals. We have initiated the validation process and discuss the level of agreement between our simulation and experimental results reported in the literature, focusing on heat pulse propagation in germanium. The simulation framework is implemented using Geant4, a toolkit originally developed for high-energy physics Monte Carlo simulations. Geant4 has also been used for nuclear and accelerator physics, and applications in medical and space sciences. We believe that our current work may open up new avenues for applications in material science and condensed matter physics.

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Section: Validating the Geant4 Implementationmentioning

confidence: 84%

“…1 shows an observed intensity pattern in Ge reported by Nothrop and Wolfe [8]. The left-hand panel shows an intensity pattern generated using the Geant4 phonon transport code.…”

Section: Validating the Geant4 Implementationmentioning

confidence: 86%