期刊
NANO LETTERS
卷 15, 期 7, 页码 4269-4273出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl5044665
关键词
Nanoparticles; Ballistic heat transport; Superdiffusion; Levy flight; Thermal Conductivity; Thermoelectric materials
类别
资金
- Center for Energy Efficient Materials, an Energy Frontier Research Center - U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0001009]
Materials with embedded nanoparticles are of considerable interest for thermoelectric applications. Here, we experimentally characterize the effect of nanoparticles on the recently discovered Levy phonon transport in semiconductor alloys. The fractal space dimension alpha approximate to 1.55 of quasiballistic (superdiffusive) heat conduction in (ErAs)(x):InGaAlAs is virtually independent of the Er content 0.001 < x < 0.1 but instead controlled by alloy scattering of the host matrix. The increased nanoparticle concentration does reduce the diffusive recovery length by an order of magnitude. The bulk conductivity drops by 3-fold, in close agreement with a Callaway model. Our results may provide helpful hints toward engineering superdiffusive heat transport similar to what has been achieved with light in Levy glasses.
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