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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Quantum Entropic Self-Localization with Ultracold Fermions.

Mikhail Mamaev1,2,3, Itamar Kimchi1,2,3, Michael A Perlin1,2,3

  • 1JILA and NIST, University of Colorado, Boulder, Colorado 80309, USA.

Physical Review Letters
|November 8, 2019
PubMed
Summary
This summary is machine-generated.

We discovered entropic self-localization in a driven fermionic system. Odd atoms form bound states due to entropy, while even atoms propagate ballistically, revealing novel constrained dynamics.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Simulation
  • Ultracold Atoms

Background:

  • Spin-orbit coupled fermionic systems in driven lattices exhibit complex behaviors.
  • Resonant driving conditions can lead to emergent constrained dynamics.

Purpose of the Study:

  • To investigate the dynamics of a driven, spin-orbit coupled fermionic system at resonance.
  • To explore phenomena arising from constrained dynamics in a lattice system.

Main Methods:

  • Derivation of an effective density-dependent tunneling model.
  • Analysis of the model in the sparse filling regime in one dimension.

Main Results:

  • Observed entropic self-localization: even atoms propagate ballistically, odd atoms form localized bound states.
  • Identified phenomena arising from effective attraction due to configurational entropy.
  • Demonstrated constrained dynamics leading to quantum few-body scars.

Conclusions:

  • Constrained dynamics in strong coupling limits can generate novel quantum phenomena.
  • The system maps to an Anderson impurity model with nonreciprocal scattering.
  • The study provides insights into many-body scars and localization in driven quantum systems.