An electrical probe of the phonon mean-free path spectrum

作者：Ramu Ashok T^*; Halaszynski Nicole I; Peters Jonathan D; Meinhart Carl D; Bowers John E

来源：Scientific Reports, 2016, 6(1): 33571.

DOI：10.1038/srep33571

Most studies of the mean-free path accumulation 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.

• 出版日期2016-9-28