We study the eigenstates of a paradigmatic model of many-body localization in the Fock basis constructed out of the natural orbitals. By numerically studying the participation ratio, we identify a sharp crossover between different phases at a disorder strength close to the disorder strength at which subdiffusive behaviour sets in, significantly below the many-body localization transition. We repeat the analysis in the conventionally used computational basis, and show that many-body localized eigenstates are much stronger localized in the Fock basis constructed out of the natural orbitals than in the computational basis.
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- 1 Institute of Physics, University of Amsterdam [IoP, UvA]
- 2 Международный центр квантовой оптики и квантовых технологий / Russian Quantum Center
- 3 Universiteit Leiden / Leiden University [UL]