Many-body localization in the Fock space of natural orbitals

Wouter Buijsman, Vladimir Gritsev, Vadim Cheianov

SciPost Phys. 4, 038 (2018) · published 25 June 2018


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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Disordered systems Many-body localization (MBL) Subdiffusion

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