Enhancement of chaotic subdiffusion in disordered ladders with synthetic gauge fields

Xiaoquan Yu and Sergej Flach
Phys. Rev. E 90, 032910 – Published 11 September 2014

Abstract

We study spreading wave packets in a disordered nonlinear ladder with broken time-reversal symmetry induced by synthetic gauge fields. The model describes the dynamics of interacting bosons in a disordered and driven optical ladder within a mean-field approximation. The second moment of the wave packet m2=gtα grows subdiffusively with the universal exponent α1/3 similar to the time-reversal case. However, the prefactor g is strongly modified by the field strength and shows a nonmonotonic dependence. For a weak field, the prefactor increases since time-reversal enhanced backscattering is suppressed. For strong fields the spectrum of the linear wave equation reduces the localization length through the formation of gaps and narrow bands. Consequently the prefactor for the subdiffusive spreading law is suppressed.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
5 More
  • Received 14 April 2014
  • Revised 27 August 2014

DOI:https://doi.org/10.1103/PhysRevE.90.032910

©2014 American Physical Society

Authors & Affiliations

Xiaoquan Yu and Sergej Flach

  • New Zealand Institute for Advanced Study, Centre for Theoretical Chemistry and Physics, Massey University, Auckland 0745, New Zealand

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 90, Iss. 3 — September 2014

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review E

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×