An electrical probe of the phonon mean-free path spectrum.
Most studies of the mean-free path accumulation function (MFPAF) rely on optical techniques to probe heat transfer at length scales on the order of the phonon mean-free path. In this paper, we propose and implement a purely electrical probe of the MFPAF that relies on photo-lithographically defined heater-thermometer separation to set the length scale. An important advantage of the proposed technique is its insensitivity to the thermal interfacial impedance and its compatibility with a large array of temperature-controlled chambers that lack optical ports. Detailed analysis of the experimental data based on the enhanced Fourier law (EFL) demonstrates that heat-carrying phonons in gallium arsenide have a much wider mean-free path spectrum than originally thought.
Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, California, CA 93106, USA.
Ashok T
AT
Ramu
Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, California, CA 93106, USA.
Nicole I
NI
Halaszynski
Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, California, CA 93106, USA.
Jonathan D
JD
Peters
Department of Mechanical Engineering, University of California Santa Barbara, Santa Barbara, California, CA 93106, USA.
Carl D
CD
Meinhart
Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, California, CA 93106, USA.
John E
JE
Bowers
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