scispace - formally typeset
Search or ask a question
Topic

Mean free path

About: Mean free path is a research topic. Over the lifetime, 4412 publications have been published within this topic receiving 114418 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors studied the transport of electrons in Teflon FEP type A under isothermal conditions (145°C) in open circuit and suggested a theoretical model including surface, shallow, and deep traps.
Abstract: In this paper we study theoretically and experimentally the transport of electrons in Teflon FEP type A under isothermal conditions (145 °C) in open circuit. We suggest a theoretical model including surface, shallow, and deep traps. The model leads to a system of partial differential equations which was solved numerically using a finite‐step algorithm. By fitting the theoretical to the experimental surface‐voltage decay curves we found a shallow‐trap‐modulated mobility μQ=1.6×10−12 cm2/V sec, a deep‐trap‐modulated transit time tT=1.25×105 sec in the voltage range of −200 to −400 V for electrons in 25‐μm‐thick material. We also determined the time constants for surface injection, trapping, and detrapping. The deep‐trap‐modulated transit time is in good agreement with measured values. Further we found a voltage‐independent mean free path for the shallow‐trapped carriers λ=6.5 μm. These traps were assumed to be in thermal equilibrium with the free carriers in the conduction band.

64 citations

Journal ArticleDOI
TL;DR: In this article, the thermal conductance of straight and corrugated monocrystalline silicon nanowires has been measured between 0.3 k and 5 k. The experimental averaged mean free path is remarkably smaller than the smaller diameter of the nanowire, evidencing a phonon thermal transport reduced below the Casimir limit.
Abstract: The thermal conductance of straight and corrugated monocrystalline silicon nanowires has been measured between 0.3 K and 5 K. It is demonstrated that the corrugation strongly reduces the thermal transport by reducing the mean free path of the phonons. The experimental averaged mean free path is remarkably smaller than the smaller diameter of the nanowire, evidencing a phonon thermal transport reduced below the Casimir limit. Monte Carlo simulations highlight that this effect can be attributed to significant multiple scattering of ballistic phonons occurring on the corrugated surfaces. This result suggests an original approach to transforming a monocrystalline material into a phonon glass.

64 citations

Journal ArticleDOI
TL;DR: A vibrating wire viscometer has been constructed using superconducting wire of diameter 58 µm in the form of a semicircular loop of radius 1.4 cm fixed at both ends and oscillating in a direction perpendicular to the plane of the loop as discussed by the authors.
Abstract: A vibrating wire viscometer has been constructed using superconducting wire of diameter 58 µm in the form of a semicircular loop of radius 1.4 cm fixed at both ends and oscillating in a direction perpendicular to the plane of the loop. The use of the viscometer to measure the viscosity of normal phase3He is described and the corrections that have been applied to the data to allow for the finiteQ of the resonance, a quasiparticle mean free path comparable to the wire diameter, and a viscous penetration depth comparable to the size of the channel containing the wire are discussed. The measured viscosities show small departures from the ηT 2=const law of Fermi liquid theory similar to those observed in some but not all previous measurements. The values of the viscosity at the superfluid transition temperature agree with those obtained in other measurements.

64 citations

Journal ArticleDOI
01 Sep 2021-Optik
TL;DR: In this article, the mass attenuation coefficient has been derived using EPICS2017 library, which is higher than that determined by Phy-X/PSD by approximately 2.5% for the five glass samples.

64 citations

Journal ArticleDOI
TL;DR: By starting from the Mayadas-Shatzkes model an effective mean free path l g is defined to describe electronic conduction in thin polycrystalline metallic films; the Fuchs-Sondheimer model can then be used to calculate the film resistivity and its temperature coefficient.

63 citations


Network Information
Related Topics (5)
Electron
111.1K papers, 2.1M citations
89% related
Magnetic field
167.5K papers, 2.3M citations
89% related
Magnetization
107.8K papers, 1.9M citations
87% related
Scattering
152.3K papers, 3M citations
86% related
Band gap
86.8K papers, 2.2M citations
85% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202375
2022207
2021134
2020114
2019113
201887