External electric field driving the ultra-low thermal conductivity of silicene

Nanoscale
Guangzhao QinMing Hu

Abstract

The manipulation of thermal transport is in increasing demand as heat transfer plays a critical role in a wide range of practical applications, such as efficient heat dissipation in nanoelectronics and heat conduction hindering in solid-state thermoelectrics. It is well established that the thermal transport in semiconductors and insulators (phonons) can be effectively modulated by structure engineering or materials processing. However, almost all the existing approaches involve altering the original atomic structure of materials, which would be hindered due to either irreversible structure change or limited tunability of thermal conductivity. Motivated by the inherent relationship between phonon behavior and interatomic electrostatic interaction, we comprehensively investigate the effect of external electric field, a widely used gating technique in modern electronics, on the lattice thermal conductivity (κ). Taking two-dimensional silicon (silicene) as a model, we demonstrate that by applying an electric field (Ez = 0.5 V Å-1) the κ of silicene can be reduced to a record low value of 0.091 W m-1 K-1, which is more than two orders of magnitude lower than that without an electric field (19.21 W m-1 K-1) and is even comparable to...Continue Reading

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Citations

Sep 20, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Tao WuRuifeng Lu
Oct 20, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Tao WuRuifeng Lu
Nov 22, 2020·Physical Chemistry Chemical Physics : PCCP·Ming Hu, Zhonghua Yang
Apr 18, 2021·Physical Review. E·Liujun XuXiaoping Ouyang
Oct 20, 2021·The Journal of Physical Chemistry Letters·Huimin WangJianxin Zhong

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