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.
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TL;DR: In the case of high molecular weight and relatively few sp3 defects, even relatively weak interchain coupling is sufficient to avoid one-dimensional localization; this leads to coherent transport with a mean free path that is limited by either the mean separation between chain imperfections or by phonon scattering.
246 citations
TL;DR: The high temperature, normal state resistivity of strong coupled superconducting transition metal compounds and other materials with high resistivities saturates at a value corresponding to an electron mean free path of order the interatomic spacing as mentioned in this paper.
Abstract: The high temperature, normal state resistivity of strong coupled superconducting transition metal compounds and other materials with high resistivities saturates at a value corresponding to an electron mean free path of order the interatomic spacing. This accounts for the nonlinear temperature dependence of the resistivity observed in these compounds at high temperature.
244 citations
TL;DR: In this paper, it was shown that in multilayered heterojunction structures the effective impact ionisation rates for electrons and holes can be very different, even if they are the same in the basic bulk materials.
Abstract: Calculations are reported showing that in multilayered heterojunction structures the effective impact ionisation rates for electrons and holes can be very different, even if they are the same in the basic bulk materials. The reason for this is the difference in the band-edge discontinuities for electrons and holes and the lower phonon mean free path for holes in quantum well structures.
240 citations
TL;DR: In this article, a rigorous derivation for the thermal conductivity accumulation function and mean free path (MFP) spectrum of an isotropic bulk material is given, where the key physical insight is to express the kinetic theory integral in terms of MFP rather than frequency.
Abstract: A rigorous derivation is given for the thermal conductivity accumulation function and mean free path (MFP) spectrum of an isotropic bulk material. The key physical insight is to express the kinetic theory integral in terms of MFP rather than frequency. Extending this framework to incorporate boundary scattering in nanostructures leads to an integral equation that transforms a material's bulk MFP spectrum into the size-dependent thermal conductivity of the nanostructure. The kernel of this transform represents the boundary scattering rule for the particular type of nanostructure. The principal benefit of this transform is that it requires only a single function, the material's bulk MFP spectrum, or equivalently its accumulation function. Explicit knowledge of the material's dispersion relation and frequency-dependent bulk MFPs is not needed, nor is a summation over polarizations, because the bulk MFP spectrum already contains this information in exactly the form required to evaluate boundary scattering. The utility of this framework is demonstrated through a case study of six models for the phonon thermal conductivity of silicon: three analytical, one gray, and two numerical.
237 citations
TL;DR: These results suggest that delta-doped SrTiO3 provides a model system in which to explore the quantum transport and interplay of both superconducting and normal electrons, and demonstrate that high-quality complex oxide heterostructures can maintain electron coherence on the macroscopic scales probed by transport, as well as on the microscopic scales demonstrated previously.
Abstract: Heavily doped semiconductors can exhibit superconductivity, but their performance is severely limited by extremely large electronic disorder. Similarly, the electron mean free path in low-dimensional superconducting thin films is usually limited by interface scattering or atomic-scale disorder. Kozuka et al. use niobium doping to fabricate a high-quality, two-dimensional superconducting layer within a thin-film heterostructure based on the first known superconducting semiconductor, SrTiO3. This should provide a model system in which to explore the quantum transport and interplay of both superconducting and normal electrons.
234 citations