Phonon superlattice transport
- 1 November 1997
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 56 (17) , 10754-10757
- https://doi.org/10.1103/physrevb.56.10754
Abstract
We predict in Si/Ge superlattices a dramatic high-temperature suppression of the perpendicular thermal transport. Total internal reflection confines the superlattice modes and significantly reduces the average group velocity at nonzero in-plane momenta. These consequences of the acoustic mismatch cause at high temperatures an order-of-magnitude reduction in the ratio of superlattice thermal conductivity to phonon relaxation time.Keywords
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