Many-body localization in the interpolating Aubry-André-Fibonacci model

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2021
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Štrkalj, Antonio
Doggen, Elmer V. H.
Gornyi, Igor V.
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Physical Review Research. American Physical Society (APS). 2021, 3(3), 033257. eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.3.033257
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We investigate the localization properties of a spin chain with an antiferromagnetic nearest-neighbour coupling, subject to an external quasiperiodic on-site magnetic field. The quasiperiodic modulation interpolates between two paradigmatic models, namely the Aubry-Andr'e and the Fibonacci models. We find that stronger many-body interactions extend the ergodic phase in the former, whereas they shrink it in the latter. Furthermore, the many-body localization transition points at the two limits of the interpolation appear to be continuously connected along the deformation. As a result, the position of the many-body localization transition depends on the interaction strength for an intermediate degree of deformation of the quasiperiodic modulation. Moreover, in the region of parameter space where the single-particle spectrum contains both localized and extended states, many-body interactions induce an anomalous effect: weak interactions localize the system, whereas stronger interactions enhance ergodicity. We map the model's localization phase diagram using the decay of the quenched spin imbalance in relatively long chains. This is accomplished employing a time-dependent variational approach applied to a matrix product state decomposition of the many-body state. Our model serves as a rich playground for testing many-body localization under tunable potentials.

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ISO 690ŠTRKALJ, Antonio, Elmer V. H. DOGGEN, Igor V. GORNYI, Oded ZILBERBERG, 2021. Many-body localization in the interpolating Aubry-André-Fibonacci model. In: Physical Review Research. American Physical Society (APS). 2021, 3(3), 033257. eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.3.033257
BibTex
@article{Strkalj2021-06-25T18:40:03ZManyb-58457,
  year={2021},
  doi={10.1103/PhysRevResearch.3.033257},
  title={Many-body localization in the interpolating Aubry-André-Fibonacci model},
  number={3},
  volume={3},
  journal={Physical Review Research},
  author={Štrkalj, Antonio and Doggen, Elmer V. H. and Gornyi, Igor V. and Zilberberg, Oded},
  note={Article Number: 033257}
}
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