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Kosterlitz-Thouless scaling at many-body localization phase transitions

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [5]
  1. Flatiron Institute, New York, NY (United States); UMass Amherst
  2. Univ. de Geneve, Geneve (Switzerland); IST Austria, Klosterneuburg (Austria)
  3. Univ. of Oxford, Oxford (United Kingdom)
  4. IST Austria, Klosterneuburg (Austria)
  5. Univ. of Massachusetts, Amherst, MA (United States)
We propose a scaling theory for the many-body localization (MBL) phase transition in one dimension, building on the idea that it proceeds via a ‘quantum avalanche’. We argue that the critical properties can be captured at a coarse-grained level by a Kosterlitz-Thouless (KT) renormalization group (RG) flow. On phenomenological grounds, we identify the scaling variables as the density of thermal regions and the lengthscale that controls the decay of typical matrix elements. Within this KT picture, the MBL phase is a line of fixed points that terminates at the delocalization transition. We discuss two possible scenarios distinguished by the distribution of rare, fractal thermal inclusions within the MBL phase. In the first scenario, these regions have a stretched exponential distribution in the MBL phase. In the second scenario, the near-critical MBL phase hosts rare thermal regions that are power-law distributed in size. This points to the existence of a second transition within the MBL phase, at which these power-laws change to the stretched exponential form expected at strong disorder. In conclusion, we numerically simulate two different phenomenological RGs previously proposed to describe the MBL transition. Both RGs display a universal power-law length distribution of thermal regions at the transition with a critical exponent αc = 2, and continuously varying exponents in the MBL phase consistent with the KT picture.
Research Organization:
Univ. of Massachusetts, Amherst, MA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0019168
OSTI ID:
1502413
Alternate ID(s):
OSTI ID: 1546188
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 9 Vol. 99; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Extended slow dynamical regime close to the many-body localization transition text January 2015
Many body localization and thermalization: insights from the entanglement spectrum text January 2016
Many-body localization phase transition: A simplified strong-randomness approximate renormalization group text January 2016
Nonequilibrium quantum dynamics and transport: from integrability to many-body localization text January 2016
Diffusive and subdiffusive spin transport in the ergodic phase of a many-body localizable system text January 2016
Diagonalization and Many-Body Localization for a Disordered Quantum Spin Chain text January 2016
Critical Properties of the Many-Body Localization Transition text January 2016
Thouless energy and multifractality across the many-body localization transition text January 2016
Rare region effects and dynamics near the many-body localization transition text January 2016
Scaling Theory of Entanglement at the Many-Body Localization Transition text January 2017
Two universality classes for the many-body localization transition text January 2017
Weak Versus Strong Disorder Superfluid-Bose Glass Transition in One Dimension text January 2017
How a small quantum bath can thermalize long localized chains text January 2017
Many-body localization as a large family of localized ground states text January 2018
Metal-insulator transition in a weakly interacting many-electron system with localized single-particle states text January 2005
Localization of interacting fermions at high temperature text January 2006
Chaos and Quantum Thermalization text January 1994
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Cited By (16)

Diffusive transport in a quasiperiodic Fibonacci chain: Absence of many-body localization at weak interactions journal August 2019
Many-body delocalization dynamics in long Aubry-André quasiperiodic chains journal September 2019
Slow dynamics and strong finite-size effects in many-body localization with random and quasiperiodic potentials journal September 2019
Measurement-induced criticality in random quantum circuits journal March 2020
Multiscale entanglement clusters at the many-body localization phase transition journal April 2019
Exact solution of a percolation analog for the many-body localization transition journal June 2019
Renormalization-group study of the many-body localization transition in one dimension journal June 2019
Multifractal Scalings Across the Many-Body Localization Transition journal October 2019
Two critical localization lengths in the Anderson transition on random graphs journal January 2020
Self-consistent theory of many-body localisation in a quantum spin chain with long-range interactions journal January 2019
Exact solution of a percolation analogue for the many-body localisation transition text January 2018
Multifractal Scalings across the Many-Body Localization Transition text January 2018
Self-consistent theory of many-body localisation in a quantum spin chain with long-range interactions text January 2019
Diffusive transport in a quasiperiodic Fibonacci chain: absence of many-body localization at small interactions text January 2019
Measurement-induced criticality in random quantum circuits text January 2019
Slow dynamics and strong finite-size effects in many-body localization with random and quasiperiodic potentials text January 2019

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