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Multiparticle composites in density-imbalanced quantum fluids.

Evgeni Burovski1, Giuliano Orso, Thierry Jolicoeur

  • 1Laboratoire de Physique Théorique et Modèles statistiques, Université Paris-Sud, 91405 Orsay, France.

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

We found that density imbalance in one-dimensional quantum gases can lead to a gapped phase, particularly when density ratios are rational. This ordering destroys superconducting correlations in attractive mixtures.

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Area of Science:

  • Condensed matter physics
  • Quantum many-body systems
  • Low-dimensional quantum mechanics

Background:

  • One-dimensional (1D) quantum gases with density imbalance exhibit complex behaviors.
  • Generic two-component systems behave as Luttinger liquids, lacking long-range order.

Purpose of the Study:

  • Investigate the emergence of gapped phases in 1D two-component quantum gases with density imbalance.
  • Determine conditions leading to ordering and the destruction of superconducting correlations.

Main Methods:

  • Theoretical analysis of two-component Luttinger liquids.
  • Investigating the role of rational density ratios (p/q) and mass asymmetry.
  • Numerical simulations of the fermionic Hubbard model with hopping asymmetry.

Main Results:

  • A gapped phase emerges when the density ratio is rational (p/q) and mass asymmetry is significant.
  • This gapped phase is characterized by the ordering of (p+q)-particle composites.
  • Superconducting correlations are destroyed in attractive mixtures within this gapped phase.

Conclusions:

  • Density imbalance in 1D quantum gases can induce novel ordered phases under specific conditions.
  • The findings provide insights into the interplay of density, mass asymmetry, and interactions in quantum systems.
  • The destruction of superconductivity highlights a new mechanism for suppressing coherent correlations.