Related Experiment Video
Updated: Mar 24, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials
Published on: January 26, 2014
The effect of four-phonon scattering on the lattice thermal conductivity of Janus WSSe and WS2 monolayers
Gang Liu1, Fengli Cao1, Xiaodong Qiu1
1School of Physics and Engineering, Henan University of Science and Technology, Luoyang, 471023, People's Republic of China. liugang8105@haust.edu.cn.
Abstract:
Recent research indicates that four-phonon (4ph) scattering plays an important role in influencing the lattice thermal conductivity (κl) of materials. Including 4ph scattering mechanism can lead to more precise predictions of κl and enable better control of heat transport through phonon engineering. In this paper, the κl values of WS2 and Janus WSSe monolayers were calculated using first-principles calculations combined with the Boltzmann transport equation. The κl values of WS2 and WSSe monolayers at 300 K are found to be 91.10 W m-1 K-1 and 50.19 W m-1 K-1, respectively, when 4ph scattering is considered. These results represent reductions of 37.31% and 25.16% compared to predictions derived solely from three-phonon (3ph) scattering models. Additionally, when 4ph scattering is included, the contribution of the ZA mode to the κl in WS2 and WSSe monolayers reduces significantly, primarily due to the reflection symmetry selection rule. The effects of the group velocity, mode Grüneisen parameter, phase space, and scattering rate of the 3ph and 4ph scattering processes are also analyzed in the article.
Related Concept Videos
Trends in Lattice Energy: Ion Size and Charge
Debye–Huckel–Onsager Conductance Equation
The de Broglie Wavelength
Van der Waals Equation
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
Van der Waals Interactions
Molecular and Ionic Solids
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...

