Work

Thermal transport in the long-range interactions Fermi-Pasta-Ulam model with weak interface

Year: 2025

Type: article

Abstract: We investigate the thermal transport properties of a one-dimensional long-range Fermi-Pasta-Ulam (β-FPU) model with the inclusion of a weak interface. The system comprises two nonlinear long-range FPU chains connected via a linear weak interface. In the model, the strength of long-range interactions diminishes with the distance between lattice sites, governed by a decay exponent -δ, where δ≥0. The weak interface is modeled using linear harmonic interactions. The equations of motion were simulated using molecular dynamics with the fourth-order Runge-Kutta method, enabling the calculation of key thermal transport quantities, including heat flux J,thermal conductivity κ, and the local temperature distribution Ti，Furthermore, an analysis of finite-size effects was conducted. We elucidate a consistent explanation for the observed critical phenomena in both heat flux and thermal conductivity.

Source: Physics Letters A

DOI: 10.1016/j.physleta.2025.130504

Authors: Qiang Zhang, Yu Xue, Kun Zhang, Haojie Luo

Institution: Guangxi University

Language: English

Topic: Thermal properties of materials

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,150

Funder: National Natural Science Foundation of China