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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Recent experimental realization of Bose-Einstein condensates (BECs) using dipolar molecules.
  • Understanding superfluidity in dissipative quantum systems.

Purpose of the Study:

  • Develop superfluid transport theory for dissipative BECs.
  • Investigate the role of two-body loss in inducing phase rigidity.
  • Explore dissipation's effect on the stability of molecular BECs.

Main Methods:

  • Theoretical modeling of superfluid transport in dissipative BECs.
  • Derivation of a generalized f-sum rule for dissipative superfluids.
  • Analysis of U(1) symmetry in dissipative systems.

Main Results:

  • Weak uniform two-body loss induces phase rigidity, enabling superfluid transport without repulsive interactions.
  • A generalized f-sum rule is derived, holding for dissipative superfluids due to weak U(1) symmetry.
  • Dissipation enhances the stability of molecular BECs with dipolar interactions.

Conclusions:

  • Dissipative effects can lead to novel superfluid properties in BECs.
  • The findings offer insights into the behavior of dipolar molecular BECs.
  • Potential experimental signatures of dissipative superfluidity are identified.