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Weyl superfluidity in a three-dimensional dipolar Fermi gas.

Bo Liu1, Xiaopeng Li2, Lan Yin3

  • 1Wilczek Quantum Center, Zhejiang University of Technology, Hangzhou 310023, China and Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.

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Researchers discovered a new topological state, anisotropic Weyl superfluidity, in a 3D dipolar Fermi gas. This state, featuring Weyl fermions, is achievable with current experimental techniques in cold atomic gases.

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Area of Science:

  • Condensed Matter Physics
  • Topological Matter
  • Quantum Gases

Background:

  • Topological states of matter exhibit exotic properties like emergent Weyl fermionic excitations.
  • Weyl superconductivity and superfluidity are fascinating topological states with unique anomalies.

Purpose of the Study:

  • To investigate the possibility of realizing an anisotropic Weyl superfluid state in a 3D dipolar Fermi gas.
  • To identify experimental signatures and phase diagram characteristics of this novel state.

Main Methods:

  • Theoretical modeling of a 3D dipolar Fermi gas with a rotating external field.
  • Analysis of the low-temperature stable phase and its properties.
  • Prediction of experimental signatures using radio-frequency spectroscopy.
  • Study of the finite temperature phase diagram.

Main Results:

  • An anisotropic Weyl superfluid state was identified as a stable low-temperature phase.
  • A direction-dependent two-body effective attraction, crucial for the state, was generated by a rotating field.
  • Experimental signatures were predicted for cold gases.
  • The transition temperature for Weyl superfluidity was found to be experimentally accessible.

Conclusions:

  • A novel anisotropic Weyl superfluid state can be realized in 3D dipolar Fermi gases.
  • The findings open avenues for experimental exploration of topological Weyl superfluidity.
  • The predicted transition temperatures are within reach for current atomic dipolar Fermi gas experiments.