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Breaking the curse of dimensionality: Solving configurational integrals for crystalline solids by tensor networks

Duc P. Truong1, Benjamin Nebgen1, Derek DeSantis1, Dimiter N. Petsev2, Kim Ø. Rasmussen1, and Boian S. Alexandrov1

Phys. Rev. Materials 9, 083802 – Published 27 August, 2025

DOI: https://doi.org/10.1103/xrbw-xr49

Abstract

Accurately evaluating configurational integrals for dense solids remains a central and difficult challenge in the statistical mechanics of condensed systems. Here, we present a tensor network approach that reformulates the high-dimensional configurational integral for identical-particle crystals into a sequence of computationally efficient summations. We represent the integrand as a high-dimensional tensor and apply tensor-train (TT) decomposition together with a custom TT-cross interpolation. This approach circumvents the need to explicitly construct the full tensor. We introduce tailored rank-1 and rank-2 schemes optimized for sharply peaked Boltzmann probability densities, typical for identical-particle crystals. When applied to the calculation of internal energy and pressure-temperature curves for crystalline Cu and Ar at high (GPa) pressures, as well as the alpha-to-beta phase transition diagram of Sn, our method accurately reproduces molecular dynamics simulation results using tight-binding, machine learning, hierarchical interacting particle–neural network, and modified embedded atom method potentials,all within seconds of computation time.

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