Two-dimensional ferroelectric crystal with temperature-invariant ultralow thermal conductivity

2025/01/17 by Wenjie Zhou, Shi Liu, Zhou, Wenjie +1 · 1 citation
Materials Science · #FOS: Physical sciences #Material Dynamics and Properties #Material Properties and Applications #Materials Science (cond-mat.mtrl-sci)

paper · pdf · doi:10.48550/arxiv.2501.09990

openalex publication_date 2025/01/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report the discovery of temperature-invariant ultralow thermal conductivity (κ) in monolayer β'-In₂Se₃, 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 particle-like phonon propagating and wave-like tunneling transport mechanisms results in a propagating-tunneling-invariant (PTI) ultralow thermal conductivity of approximately 0.6 W/mK (comparable to that of glass) over a broad temperature range (150

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• Diverse polymorphs and phase transitions in van der Waals In₂Se₃

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