scholarly journals Finite-size scaling with respect to interaction and disorder strength at the many-body localization transition

2018 ◽  
Vol 97 (22) ◽  
Author(s):  
Kazue Kudo ◽  
Tetsuo Deguchi
Keyword(s):  
Finite Size ◽  
Finite Size Scaling ◽  
Disorder Strength ◽  
Many Body ◽  
Localization Transition ◽  
Size Scaling ◽  
The Many

scholarly journals Finite-size scaling analysis of the many-body localization transition in quasiperiodic spin chains

2021 ◽  
Vol 104 (21) ◽  
Author(s):  
Adith Sai Aramthottil ◽  
Titas Chanda ◽  
Piotr Sierant ◽  
Jakub Zakrzewski
Keyword(s):  
Finite Size ◽  
Spin Chains ◽  
Scaling Analysis ◽  
Finite Size Scaling ◽  
Many Body ◽  
Localization Transition ◽  
Size Scaling ◽  
The Many

scholarly journals Signatures of a critical point in the many-body localization transition

2021 ◽  
Vol 10 (5) ◽  
Author(s):  
Ángel L. Corps ◽  
Rafael Molina ◽  
Armando Relaño
Keyword(s):  
Singular Point ◽  
Critical Point ◽  
Chaotic Behavior ◽  
Finite Size ◽  
System Size ◽  
Disorder Strength ◽  
Many Body ◽  
Localization Transition ◽  
Spectral Statistics ◽  
The Many

Disordered interacting spin chains that undergo a many-body localization transition are characterized by two limiting behaviors where the dynamics are chaotic and integrable. However, the transition region between them is not fully understood yet. We propose here a possible finite-size precursor of a critical point that shows a typical finite-size scaling and distinguishes between two different dynamical phases. The kurtosis excess of the diagonal fluctuations of the full one-dimensional momentum distribution from its microcanonical average is maximum at this singular point in the paradigmatic disordered J_1J1-J_2J2 model. For system sizes accessible to exact diagonalization, both the position and the size of this maximum scale linearly with the system size. Furthermore, we show that this singular point is found at the same disorder strength at which the Thouless and the Heisenberg energies coincide. Below this point, the spectral statistics follow the universal random matrix behavior up to the Thouless energy. Above it, no traces of chaotic behavior remain, and the spectral statistics are well described by a generalized semi-Poissonian model, eventually leading to the integrable Poissonian behavior. We provide, thus, an integrated scenario for the many-body localization transition, conjecturing that the critical point in the thermodynamic limit, if it exists, should be given by this value of disorder strength.

scholarly journals Many-body localization in the Fock space of natural orbitals

2018 ◽  
Vol 4 (6) ◽  
Author(s):  
Wouter Buijsman ◽  
Vladimir Gritsev ◽  
Vadim Cheianov
Keyword(s):  
Fock Space ◽  
Disorder Strength ◽  
Many Body ◽  
Natural Orbitals ◽  
Localization Transition ◽  
Participation Ratio ◽  
The Many ◽  
Computational Basis

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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