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Nonlocal quantum fluctuations and fermionic superfluidity in the imbalanced attractive Hubbard model.

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  • 1COMP Centre of Excellence and Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland.

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Nonlocal quantum fluctuations significantly influence fermionic superfluidity in optical lattices. Exotic superfluid states, like the Fulde-Ferrell-Larkin-Ovchinnikov phase, can emerge despite these strong fluctuations.

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Area of Science:

  • Condensed matter physics
  • Quantum many-body systems
  • Ultracold atomic gases

Background:

  • Fermionic superfluidity is a key phenomenon in condensed matter physics.
  • Optical lattices provide a controllable platform for simulating complex quantum systems.
  • Understanding the role of quantum fluctuations is crucial for predicting material properties.

Purpose of the Study:

  • To investigate fermionic superfluidity in strongly anisotropic optical lattices with attractive interactions.
  • To determine the impact of nonlocal quantum fluctuations on the superfluid transition.
  • To explore the emergence of exotic superfluid states under strong fluctuations.

Main Methods:

  • Utilizing the cluster dynamical mean-field theory (CDMFT) method.
  • Simulating systems with attractive interactions in anisotropic optical lattices.
  • Analyzing the influence of nonlocal quantum fluctuations on the order parameter.

Main Results:

  • Nonlocal quantum fluctuations dramatically impact the BCS superfluid transition.
  • Exotic superfluid states with delicate order parameter structures can emerge.
  • The Fulde-Ferrell-Larkin-Ovchinnikov phase is shown to be possible even with strong fluctuations.

Conclusions:

  • Nonlocal quantum fluctuations play a critical role in fermionic superfluidity.
  • Exotic states like the FFLO phase are robust against strong quantum fluctuations.
  • This research advances the understanding of quantum phenomena in engineered materials.