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Coherent control of thermal phonon transport in van der Waals superlattices

Guo, Ruiqiang and Jho, Young-Dahl and Minnich, Austin J. (2018) Coherent control of thermal phonon transport in van der Waals superlattices. Nanoscale, 10 (30). pp. 14432-14440. ISSN 2040-3364. doi:10.1039/c8nr02150c.

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van der Waals (vdW) heterostructures are a central focus of materials science and condensed matter physics due to the novel physical phenomena and properties obtained by precisely stacking heterogeneous atomically thin layers. vdW heterostructures are expected to allow for the coherent manipulation of THz lattice vibrations and hence heat conduction due to the ability to precisely control chemical composition at the atomic scale, but little work has focused on thermal transport in these materials. Here, we report an ab initio study of thermal transport in vdW superlattices consisting of alternating transition metal dichalcogenide atomic layers. Our calculations show that the lattice vibrational spectrum and scattering rates can be precisely manipulated by the choice of each atomically thin layer, resulting in materials with novel properties such as large thermal anisotropies approaching 200 and ultralow cross-plane thermal conductivities comparable to those of amorphous materials. Our work demonstrates how coherent manipulation of phonons in vdW superlattices can expand the property space beyond that occupied by natural materials and suggests an experimental route to realize these properties.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Guo, Ruiqiang0000-0002-1585-9980
Minnich, Austin J.0000-0002-9671-9540
Additional Information:© 2018 The Royal Society of Chemistry. The article was received on 15 Mar 2018, accepted on 07 May 2018 and first published on 21 May 2018. This work was supported by the “GIST-Caltech Research Collaboration” Project through a grant provided by Gwangju Institute of Science and Technology in 2017 and the DARPA MATRIX program under Grant No. HR0011-15-2-0039. Author contributions: R. G. performed the calculations. All authors contributed to the analysis and discussion of the results. R. G. and A. J. M. wrote the manuscript. There are no conflicts to declare.
Funding AgencyGrant Number
GIST-Caltech Research CollaborationUNSPECIFIED
Gwangju Institute of Science and TechnologyUNSPECIFIED
Defense Advanced Research Projects Agency (DARPA)HR0011-15-2-0039
Issue or Number:30
Record Number:CaltechAUTHORS:20180529-102016012
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86655
Deposited By: Tony Diaz
Deposited On:29 May 2018 17:29
Last Modified:15 Nov 2021 20:40

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