# Many-body localization in the Fock space of natural orbitals

### Submission summary

 As Contributors: Wouter Buijsman Arxiv Link: https://arxiv.org/abs/1712.06892v3 (pdf) Date accepted: 2018-06-05 Date submitted: 2018-05-31 02:00 Submitted by: Buijsman, Wouter Submitted to: SciPost Physics Academic field: Physics Specialties: Condensed Matter Physics - Theory Quantum Physics Approaches: Theoretical, Computational

### Abstract

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.

### Ontology / Topics

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Published as SciPost Phys. 4, 038 (2018)

### List of changes

Besides the changes mentioned in the reply to the referee report, in Figure 3 we have duplicated the $L=16$ data to both the left and right panel.