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PRODID:-//Microsoft Corporation//Outlook MIMEDIR//EN
VERSION:1.0
BEGIN:VEVENT
DTSTART:20131120T001500Z
DTEND:20131120T020000Z
LOCATION:Mile High Pre-Function
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:ABSTRACT: A large-scale parallel loop cluster algorithm quantum Monte Carlo simulation on the K computer is presented. On 24,576 nodes of the K computer, one Monte Carlo update of the world-line configuration of the spin-1/2 antiferromagnetic Heisenberg chain with 2,621,440 spins at inverse temperature 310,690 is executed in about 8.62 seconds, in which global union-find cluster identification on a graph of about 1.1 trillion vertices and edges is performed. By combining the nonlocal global updates and the large-scale parallelization on the K computer, we have virtually achieved about 10^17-fold speed-up. By using the highly parallelized quantum Monte Carlo algorithm, we have estimated successfully the magnitude of the first excitation gap and the antiferromagnetic correlation length of the spin-4antiferromagnetic Heisenberg chain for the first time as 0.000799 +/- 0.000005 and 10,400 +/- respectively.
SUMMARY:Loop Cluster Monte Carlo Simulation of Quantum Magnets Based on Global Union-Find Algorithm
PRIORITY:3
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