Quantum percolation in two-dimensional antiferromagnets

Details Quantum percolation in two-dimensional antiferromagnets Quantum percolation in two-dimensional antiferromagnets

2004-10-02

arxiv.org/abs/cond-mat/0410041v2

Phys. Rev. Lett. 94, 197204 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures; published version

Scientific paper

10.1103/PhysRevLett.94.197204

The interplay of geometric randomness and strong quantum fluctuations is an exciting topic in quantum many-body physics, leading to the emergence of novel quantum phases in strongly correlated electron systems. Recent investigations have focused on the case of homogeneous site and bond dilution in the quantum antiferromagnet on the square lattice, reporting a classical geometric percolation transition between magnetic order and disorder. In this study we show how inhomogeneous bond dilution leads to percolative quantum phase transitions, which we have studied extensively by quantum Monte Carlo simulations. Quantum percolation introduces a new class of two-dimensional spin liquids, characterized by an infinite percolating network with vanishing antiferromagnetic order parameter.

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