823 citations
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4 papers · 2 filters
Multi-critical point in a diluted bilayer Heisenberg quantum antiferromagnet
Anders W. Sandvik
The S=1/2 Heisenberg bilayer antiferromagnet with randomly removed inter-layer dimers is studied using quantum Monte Carlo simulations. A zero-temperature multi-critical point (p*,…
Persistent Currents in the Heisenberg chain with a weak link
T. M. R. Byrnes, R. J. Bursill, H. -P. Eckle +2
The Heisenberg chain with a weak link is studied, as a simple example of a quantum ring with a constriction or defect. The Heisenberg chain is equivalent to a spinless electron gas…
Striped phase in a quantum XY-model with ring exchange
A. W. Sandvik, S. Daul, R. R. P. Singh +1
We present quantum Monte Carlo results for a square-lattice S=1/2 XY-model with a standard nearest-neighbor coupling J and a four-spin ring exchange term K. Increasing K/J, we find…
Quantum Monte Carlo with Directed Loops
Olav F. Syljuasen, Anders W. Sandvik
We introduce the concept of directed loops in stochastic series expansion and path integral quantum Monte Carlo methods. Using the detailed balance rules for directed loops, we sho…