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11:21
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
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Fulde-Ferrell Superfluids without Spin Imbalance in Driven Optical Lattices.
Zhen Zheng1,2, Chunlei Qu1, Xubo Zou2
1Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080, USA.
Physical Review Letters
|April 9, 2016
Summary
Researchers propose a new method to achieve Fulde-Ferrell (FF) superfluids using ultracold atoms in optical lattices. This approach bypasses the need for spin imbalance, offering a novel pathway to realizing these exotic quantum states.
Area of Science:
- Quantum physics
- Condensed matter physics
- Ultracold atomic gases
Background:
- Spin-imbalanced ultracold Fermi gases are studied for Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluid phases.
- Conclusive evidence for FFLO phases remains elusive in current experimental platforms.
Purpose of the Study:
- To propose a novel method for realizing Fulde-Ferrell (FF) superfluids.
- To achieve FF superfluidity without requiring spin imbalance.
Main Methods:
- Utilizing a three-dimensional fermionic cold atom optical lattice.
- Coupling s- and p-orbital bands with a weak moving optical lattice.
- Leveraging s-wave scattering interaction for superfluid pairing.
Main Results:
- The lattice coupling induces a spin-independent asymmetric Fermi surface.
- This asymmetry, combined with s-wave interactions, facilitates FF type superfluid pairing.
- The proposed method circumvents the need for spin imbalance or Zeeman fields.
Conclusions:
- A new route for realizing FF superfluids is presented.
- This work offers a promising experimental platform for exploring exotic superfluid states without spin imbalance.
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