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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Ultracold atomic gases

Background:

  • Disorder and quasidisorder are typically associated with localization phenomena in many-body Bose systems.
  • Understanding the behavior of ultracold atoms in engineered lattice potentials is crucial for quantum simulations.

Purpose of the Study:

  • To investigate the anomalous delocalization effect induced by incommensurability in quasiperiodic lattices.
  • To explore the transition from Mott insulator to superfluid in Bose systems under quasiperiodic potentials.

Main Methods:

  • Loading ultracold atoms into two shallow periodic lattices with equal amplitude.
  • Utilizing lattices with either equal or incommensurate spatial periods.
  • Comparing experimental results with quantum Monte Carlo calculations.

Main Results:

  • Observed the onset of a Mott transition in both periodic and quasiperiodic lattice configurations.
  • Demonstrated that switching from a periodic to a quasiperiodic potential leads to a Mott insulator transforming into a delocalized superfluid.
  • Confirmed anomalous delocalization arises from the interplay between disorder and interaction.

Conclusions:

  • Incommensurability in quasiperiodic lattices can induce anomalous delocalization in many-body Bose systems, contrary to typical localization effects.
  • The transition from a Mott insulator to a delocalized superfluid is achievable by tuning the lattice potential from periodic to quasiperiodic.
  • The findings highlight a novel mechanism for controlling quantum phase transitions in ultracold atomic systems.