Disparate quasiballistic heat conduction regimes from periodic heat sources on a substrate

摘要: We report disparate quasiballistic heat conduction trends for periodic nanoscale line heaters deposited on a substrate, depending upon whether measurements are based the peak temperature of or difference between and valley two neighboring heaters. The degree transport is characterized by effective thermal conductivities substrate which obtained matching diffusion solutions to phonon Boltzmann equation (BTE) results. find that while ballistic effect diminishes as become closer, it becomes stronger peak-valley difference. Our results also show collective behavior closely spaced can counteract nonlocal effects caused an isolated hot spot. These relevant conductivity spectroscopy techniques under a) To whom correspondence should be addressed. Electronic mail: gchen2@mit.edu 2 development have important implications understanding in integrated circuits carbon nanotube array interface materials.