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Interference between independent fluctuating condensates.

Anatoli Polkovnikov1, Ehud Altman, Eugene Demler

  • 1Department of Physics, Harvard University, Cambridge, MA 02138, USA. asp@bu.edu

Proceedings of the National Academy of Sciences of the United States of America
|April 8, 2006
PubMed
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Interference patterns in fluctuating condensates reveal internal correlation functions. This method probes interactions and transitions in Bose liquids and Kosterlitz-Thouless systems.

Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Independent condensates often lack true long-range order.
  • Understanding correlations within these systems is crucial for quantum many-body physics.

Purpose of the Study:

  • To demonstrate that interference patterns of independent condensates contain information about their internal correlation functions.
  • To explore the application of interference as a probe for quantum phase transitions and correlation properties.

Main Methods:

  • Analysis of interference patterns between two independent condensates.
  • Theoretical modeling of one-dimensional (1D) and two-dimensional (2D) Bose liquids.
  • Investigation of fringe contrast distribution and full counting statistics.

Main Results:

Related Experiment Videos

  • Interference patterns encode information about correlation functions within each condensate.
  • Universal scaling of fringe contrast observed in 1D Bose liquids, dependent on the Luttinger parameter.
  • Fringe contrast distribution provides insights into high-order correlations and interaction strengths.
  • Interference in 2D condensates serves as a probe for the Kosterlitz-Thouless transition.

Conclusions:

  • Interference is a powerful tool to characterize fluctuating condensates.
  • The study provides a method to probe quantum correlations and phase transitions using interference phenomena.