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  • Open Access

Anderson Localization: A Density Matrix Approach

Ziyue Qi1,2, Yi Zhang3,4,*, Mingpu Qin5,†, Hongming Weng1,2,‡, and Kun Jiang1,2,§

  • *Contact author: zhangyi821@shu.edu.cn
  • †Contact author: qinmingpu@sjtu.edu.cn
  • ‡Contact author: hmweng@iphy.ac.cn
  • §Contact author: jiangkun@iphy.ac.cn

Phys. Rev. X 16, 011043 – Published 2 March, 2026

DOI: https://doi.org/10.1103/y5kd-7prs

Abstract

Anderson localization is a quantum phenomenon in which disorder localizes electronic wave functions. In this work, we propose a new approach to study Anderson localization based on the density matrix formalism. Drawing an analogy to the standard transfer matrix method, we extract the localization length from the modular density matrix in quasi-one-dimensional systems. This approach successfully captures the metal-insulator transition in the three-dimensional Anderson model and in the two-dimensional Anderson model with spin-orbit coupling. It can be also readily extended to multi-orbital systems. We further generalize the formalism to interacting systems, showing that the one-dimensional spinless attractive model exhibits the expected metallic phase, consistent with previous studies. More importantly, we demonstrate the existence of a two-dimensional metallic tendency in the presence of Hubbard interactions and disorder. This method offers a new perspective on Anderson localization and its interplay with interactions.

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