A short-loop algorithm for quantum Monte Carlo simulations

Details A short-loop algorithm for quantum Monte Carlo simulations A short-loop algorithm for quantum Monte Carlo simulations

2007-09-11

arxiv.org/abs/0709.1718v2

Phys. Rev. E 77, 036708 (2008)

Physics

Condensed Matter

Statistical Mechanics

9 pages, 9 figures: new FSS discussion added

Scientific paper

10.1103/PhysRevE.77.036708

We present an algorithmic framework for a variant of the quantum Monte Carlo operator-loop algorithm, where non-local cluster updates are constructed in a way that makes each individual loop smaller. The algorithm is designed to increase simulation efficiency in cases where conventional loops become very large, do not close altogether, or otherwise behave poorly. We demonstrate and characterize some aspects of the short-loop on a square lattice spin-1/2 XXZ model where, remarkably, a significant increase in simulation efficiency is observed in some parameter regimes. The simplicity of the model provides a prototype for the use of short-loops on more complicated quantum systems.

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