Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Anomalous in-plane lattice thermal conductivity in an atomically thin two-dimensional α-GeTe layer

Author affiliations

Abstract

Low lattice thermal conductivity is one of the most important physical quantities for phononic device applications. Thus, we investigated the in-plane lattice thermal conductivity of mono- and bi-layer α-GeTe systems. The lattice thermal conductivity of the monolayer system along the zigzag direction was 0.43 (W mK−1) while it was 0.21 (W mK−1) along the armchair direction at 300 K, and the lattice thermal conductivity mostly originated from the out-of-plane acoustic mode. In the bilayer system, it was significantly suppressed to 0.044 (W mK−1) and 0.047 (W mK−1) along the zigzag and armchair directions, respectively, at 300 K. Particularly, the out-of-plane acoustic mode in the bilayer had a tremendous Grüneisen parameter and this led to an ultralow in-plane lattice thermal conductivity in the bilayer, and the optical mode dominated the contribution to the lattice thermal conductivity. Our findings may raise intriguing issues regarding the thermoelectric effect, heat insulators, and phononic device applications, and stimulate further experimental studies to verify our theoretical predictions.

Graphical abstract: Anomalous in-plane lattice thermal conductivity in an atomically thin two-dimensional α-GeTe layer

Back to tab navigation

Supplementary files

Article information


Submitted
10 Feb 2020
Accepted
04 May 2020
First published
04 May 2020

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Paper

Anomalous in-plane lattice thermal conductivity in an atomically thin two-dimensional α-GeTe layer

B. Marfoua, Y. S. Lim and J. Hong, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/D0CP00738B

Social activity

Search articles by author

Spotlight

Advertisements