Construction of cubic nonlinear lattice free from umklapp processes Article Swipe

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Ono Hiroki , Doi Yusuke , Nakatani Akihiro ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2511.03362

We propose a novel type of umklapp-free lattice (UFL), where umklapp processes are completely absent. The proposed UFL incorporates cubic long-range nonlinearity, a feature not addressed in previous studies. In this paper, we derive an analytical expression for the cubic nonlinear coupling constants by imposing mathematical conditions such that the nonlinear coupling strength between particle pairs decays inversely with their separation distance. The absence of umklapp processes in the proposed lattice is confirmed through numerical comparisons with the Fermi-Pasta-Ulam-Tsingou (FPUT) lattice. Furthermore, molecular dynamics simulations are performed to investigate the thermal conductivity of the proposed lattice in the non-equilibrium steady state. Compared to the original FPUT lattice, the proposed UFL is closer to ballistic transport. Our results demonstrate that the umklapp processes induced by cubic nonlinearity are suppressed in the proposed UFL. Moreover, compared to the UFL with only quartic nonlinearity, truncation of long-range interactions plays a significant role in the proposed lattice.

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Lattice (music) Nonlinear system Quartic function Physics Statistical physics Condensed matter physics Cubic crystal system Lattice constant Coupling (piping) Coupling constant Curse of dimensionality Thermal Mathematics Crystal structure Quantum mechanics Truncation (statistics)

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Type: preprint
Landing Page: https://doi.org/10.48550/arxiv.2511.03362
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DOI: https://doi.org/10.48550/arxiv.2511.03362

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Title: Construction of cubic nonlinear lattice free from umklapp processes

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Publication year: 2025

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Publication date: 2025-11-05

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Authors: Ono Hiroki, Doi Yusuke, Nakatani Akihiro

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Landing page: https://doi.org/10.48550/arxiv.2511.03362

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Concepts: Lattice (music), Nonlinear system, Quartic function, Physics, Statistical physics, Condensed matter physics, Cubic crystal system, Lattice constant, Coupling (piping), Coupling constant, Curse of dimensionality, Thermal, Mathematics, Crystal structure, Quantum mechanics, Truncation (statistics)

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