Kapitza phonon transmission from clean H‐silicon(111) surfaces into liquid helium

Wichert, K. H.; Reimann, C.T.; Blahusch, G.; Kinder, H.

doi:10.1002/andp.19955070303

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…These phonons propagate across the interface and are then detected in the material on the other side. This type of experiment has been performed for interfaces between solids and liquid helium ͑see, for example, Wichert et al 15 ͒ and at solid-solid interfaces ͑for a review, see Ref.…”

Section: B Heat Pulse and Coherent Phonon Experimentsmentioning

confidence: 99%

Nanoscale thermal transport

Cahill

Ford

Goodson

et al. 2003

Journal of Applied Physics

2,683

1,828

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Rapid progress in the synthesis and processing of materials with structure on nanometer length scales has created a demand for greater scientific understanding of thermal transport in nanoscale devices, individual nanostructures, and nanostructured materials. This review emphasizes developments in experiment, theory, and computation that have occurred in the past ten years and summarizes the present status of the field. Interfaces between materials become increasingly important on small length scales. The thermal conductance of many solid-solid interfaces have been studied experimentally but the range of observed interface properties is much smaller than predicted by simple theory. Classical molecular dynamics simulations are emerging as a powerful tool for calculations of thermal conductance and phonon scattering, and may provide for a lively interplay of experiment and theory in the near term. Fundamental issues remain concerning the correct definitions of temperature in nonequilibrium nanoscale systems. Modern Si microelectronics are now firmly in the nanoscale regime-experiments have demonstrated that the close proximity of interfaces and the extremely small volume of heat dissipation strongly modifies thermal transport, thereby aggravating problems of thermal management. Microelectronic devices are too large to yield to atomic-level simulation in the foreseeable future and, therefore, calculations of thermal transport must rely on solutions of the Boltzmann transport equation; microscopic phonon scattering rates needed for predictive models are, even for Si, poorly known. Low-dimensional nanostructures, such as carbon nanotubes, are predicted to have novel transport properties; the first quantitative experiments of the thermal conductivity of nanotubes have recently been achieved using microfabricated measurement systems. Nanoscale porosity decreases the permittivity of amorphous dielectrics but porosity also strongly decreases the thermal conductivity. The promise of improved thermoelectric materials and problems of thermal management of optoelectronic devices have stimulated extensive studies of semiconductor superlattices; agreement between experiment and theory is generally poor. Advances in measurement methods, e.g., the 3 method, time-domain thermoreflectance, sources of coherent phonons, microfabricated test structures, and the scanning thermal microscope, are enabling new capabilities for nanoscale thermal metrology.

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Section: B Heat Pulse and Coherent Phonon Experimentsmentioning

confidence: 99%

Nanoscale thermal transport

Cahill

Ford

Goodson

et al. 2003

Journal of Applied Physics

2,683

1,828

View full text Add to dashboard Cite

show abstract

“…1 Experimental techniques to measure such ET include time-resolved femtosecond spectroscopy for ET within photoexcited biomolecules, 2 methods for measuring the thermal conductivity within a molecular chain, 3 suspensions of nanoparticles, 4 and multilayered solid nanostructures. 1,[5][6][7][8] ET mechanisms include vibrational energy transport 2,9 and thermal conductance along the biomolecule-host fluid interface. 10 Molecular dynamics (MD) simulations capture low-frequency phonon-like molecular excitations; 11 they give insights into factors influencing the heat transfer through nanoscale interfaces.…”

Section: Introductionmentioning

confidence: 99%

Energy transfer between a nanosystem and its host fluid: A multiscale factorization approach

Sereda

Espinosa-Duran

Ortoleva

2014

The Journal of Chemical Physics

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Energy transfer between a macromolecule or supramolecular assembly and a host medium is considered from the perspective of Newton's equations and Lie-Trotter factorization. The development starts by demonstrating that the energy of the molecule evolves slowly relative to the time scale of atomic collisions-vibrations. The energy is envisioned to be a coarse-grained variable that coevolves with the rapidly fluctuating atomistic degrees of freedom. Lie-Trotter factorization is shown to be a natural framework for expressing this coevolution. A mathematical formalism and workflow for efficient multiscale simulation of energy transfer is presented. Lactoferrin and human papilloma virus capsid-like structure are used for validation.

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“…No attempt was made to get an atomically clean surface[6]. The vacuum chamber was pumped at room temperature for 12 h and then cooled down to 1.15 K where all experiments were performed.…”

mentioning

confidence: 99%

The influence of thin helium films on the phonon spectrum of optically excited silicon

1995

Self Cite

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We have studied the phonon spectra resulting from laser pulse excitation of a silicon surface We used a phonon spectrometer based on pressure tuned boron levels in silicon (Si: B-spectrometer). A new design allowed us to use the spectrometer in vacuum for the first time. We observed phonon frequencies up to 1 THz. The pulse shapes indicated both, quasidiffusion and a long exciton lifetime. On adding helium films to the surface we have found dramatic changes of the spectrum. Full thermalisation was reached already at a thickness of 1.5 monolayers. This indicates a strong anharmonic interaction in the very first monolayers at these high frequencies and, in addition, a strong confinement of the phonons to the surface by quasidiffusion.

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Kapitza phonon transmission from clean H‐silicon(111) surfaces into liquid helium

Cited by 4 publications

References 13 publications

Nanoscale thermal transport

Nanoscale thermal transport

Energy transfer between a nanosystem and its host fluid: A multiscale factorization approach

The influence of thin helium films on the phonon spectrum of optically excited silicon

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