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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Exotic vortex lattices in a rotating binary dipolar Bose-Einstein condensate.

Xiao-Fei Zhang1, Lin Wen2, Cai-Qing Dai3

  • 1Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, People's Republic of China.

Scientific Reports
|January 19, 2016
PubMed
Summary

Researchers explored rotating dipolar quantum gases with arbitrary dipole orientations. They found vortex structures depend on interaction strength, rotation, and dipole alignment, revealing new quantum control possibilities.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Atomic physics

Background:

  • Recent advances in dipolar quantum gases.
  • Limited theoretical studies on rotating binary dipolar Bose-Einstein condensates with specific dipole orientations (perpendicular or parallel to motion).

Purpose of the Study:

  • Investigate ground-state and rotational properties of a rotating binary dipolar Bose-Einstein condensate with arbitrary dipole orientations.
  • Analyze the influence of dipole orientation on system behavior.

Main Methods:

  • Theoretical investigation of a rotating binary dipolar Bose-Einstein condensate.
  • Analysis of ground-state and rotational properties for varied dipole orientations.
  • Examination of the interplay between dipolar, contact interactions, and rotation frequency.

Main Results:

  • Ground-state vortex structures are highly sensitive to interaction strengths, rotation frequency, and dipole orientation.
  • Tunable dipolar interactions control cloud squeezing/expansion and phase transitions (coexistence/separation) in the absence of rotation.
  • Exotic vortex configurations (kernel-shell, vortex necklace, compensating stripe) emerge under finite rotation.
  • Feynman relation validity confirmed with no significant deviations.

Conclusions:

  • Arbitrary dipole orientation significantly impacts dipolar quantum gas properties.
  • Novel quantum control pathways for dipolar quantum gases are identified.
  • The study provides a comprehensive understanding of rotating dipolar Bose-Einstein condensates.