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Quantum percolation in two-dimensional antiferromagnets.

Rong Yu1, Tommaso Roscilde, Stephan Haas

  • 1Department of Physics and Astronomy, University of Southern California, Los Angeles, 90089-0484, USA.

Physical Review Letters
|August 11, 2005
PubMed
Summary
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Inhomogeneous bond dilution in quantum magnets drives novel percolative quantum phase transitions. This research reveals a new class of two-dimensional spin liquids with unique percolating networks.

Area of Science:

  • Quantum many-body physics
  • Condensed matter physics

Background:

  • Geometric randomness and quantum fluctuations drive novel quantum phases in correlated electron systems.
  • Homogeneous dilution in quantum antiferromagnets shows classical percolation transitions.
  • Understanding quantum percolation in disordered systems is crucial.

Purpose of the Study:

  • Investigate percolative quantum phase transitions driven by inhomogeneous bond dilution.
  • Explore the properties of resulting quantum phases in disordered spin systems.

Main Methods:

  • Extensive quantum Monte Carlo simulations were employed.
  • Analysis focused on the behavior of the antiferromagnetic order parameter.

Main Results:

Related Experiment Videos

  • Inhomogeneous bond dilution leads to percolative quantum phase transitions.
  • A new class of two-dimensional spin liquids emerges.
  • These spin liquids exhibit an infinite percolating network structure.
  • The antiferromagnetic order parameter vanishes in these novel phases.

    • Conclusions:

    • Quantum percolation offers a new route to exotic quantum phases.
    • Inhomogeneous dilution is key to realizing these novel spin liquid states.