Two-dimensional ferroelectric crystal with temperature-invariant ultralow thermal conductivity
Year: 2025
Type: article
Abstract: We report the discovery of temperature-invariant ultralow thermal conductivity ($\ensuremath{\kappa}$) in monolayer ${\ensuremath{\beta}}^{\ensuremath{'}}\text{\ensuremath{-}}{\mathrm{In}}_{2}{\mathrm{Se}}_{3}$, a two-dimensional ferroelectric crystal with in-plane polarization. Using a combination of generalized Wigner transport equation theory and machine-learning-assisted molecular dynamics simulations, we reveal that the balance between particlelike phonon propagating and wavelike tunneling transport mechanisms results in a propagating-tunneling-invariant ultralow thermal conductivity of approximately 0.6 W/mK (comparable to that of glass) over a broad temperature range ($150 3$. These findings provide fundamental insights into the interplay between field-tunable lattice anharmonicity, phonon dynamics, and thermal transport mechanisms.
DOI: 10.1103/3nqr-9b32
Authors: Wenjie Zhou, Changming Ke, Shi Liu
Institutions: Westlake University, Zhejiang University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4415231505