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  • Letter
  • Open Access

Measuring a localization phase diagram controlled by the interplay of disorder and driving

Peter Dotti, Yifei Bai*, Toshihiko Shimasaki*, Anna R. Dardia, and David M. Weld†

  • *These authors contributed equally to this work.
  • †Contact author: weld@ucsb.edu
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Phys. Rev. Research 7, L022026 – Published 28 April, 2025

DOI: https://doi.org/10.1103/PhysRevResearch.7.L022026

Abstract

The interplay of various localizing mechanisms is a central topic of modern condensed matter physics. In this work we experimentally explore the interplay between quasiperiodic disorder and periodic driving, each of which in isolation is capable of driving a metal-insulator phase transition. Using a 1D quasiperiodic cold-atom chain we measure transport across the full phase diagram varying both drive strength and quasidisorder strength. We observe lobes of metallic phases bounded by quantum phase transitions which depend on both drive and disorder. While these observations are broadly consistent with expectations from a high-drive-frequency theoretical model, we also observe clear departures from the predictions of this model, including anomalous changes in localization behavior at lower drive frequency. We demonstrate experimentally and theoretically that understanding the full measured phase diagram requires an extension to commonly used approximate theories of Floquet matter.

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Phys. Rev. Research 7, L022026– Published 28 April, 2025
  • Received 21 June 2024
  • Accepted 11 March 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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