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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Polarization-driven enhancement of the thermal switch ratio arising from strong four-phonon scattering in bilayer
Zhuo Zhao1,2, Jian Zhang1,2, Wu-Xing Zhou3
1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China. zhangjian@bit.edu.cn.
Abstract:
Ferroelectric (FE) and antiferroelectric (AFE) materials have recently emerged as promising candidates for active thermal management, giving rise to a range of novel physical phenomena. However, thermal transport in relation to polarization switching remains insufficiently explored. In this work, we investigate the thermal transport properties of bilayer 2H α-In2Se3 in both the FE and AFE phases using neuroevolution potentials (NEP) combined with the Wigner transport equation. Our results reveal that following the polarization phase transition, the thermal conductivity in bilayer 2H α-In2Se3 is significantly suppressed. Specifically, only considering the three-phonon process may underestimate the thermal switch ratio. When four-phonon scattering is taken into account, the thermal switching ratio (κFE/κAFE) increases from 1.3 to 1.9 at 300 K. Furthermore, with increasing temperature, the coherent contribution to the thermal conductivity gradually increases. These results explain the underlying mechanisms of thermal transport in bilayer ferroelectric materials with polarization, and provide new insights for the design of nanoscale thermal management devices.
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