Ground state of the random-bond spin-1 Heisenberg chain

Article

关键词: MATRIX RENORMALIZATION-GROUP;    QUANTUM MONTE-CARLO;    PHASE;    FIELD;   

DOI  :  10.1103/PhysRevB.66.134407

来源: SCIE

【 摘 要 】

Stochastic series expansion quantum Monte Carlo is used to study the ground state of the antiferromagnetic spin-1 Heisenberg chain with bond disorder. Typical spin- and string-correlation functions behave in accordance with real-space renormalization group predictions for the random-singlet phase. The average string-correlation function decays algebraically with an exponent of -0.378(6), in very good agreement with the prediction of -(3-root5)/2similar or equal to-0.382, while the average spin-correlation function is found to decay with an exponent of about -1, quite different from the expected value of -2. By implementing the concept of directed loops for the spin-1 chain we show that autocorrelation times can be reduced by up to two orders of magnitude.

【 授权许可】

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