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• W2300869610 abstract "We use a strong-disorder renormalization group (SDRG) method and ground-state quantum Monte Carlo (QMC) simulations to study S=1/2 spin chains with random couplings, calculating disorder-averaged spin and dimer correlations. The QMC simulations demonstrate logarithmic corrections to the power-law decaying correlations obtained with the SDRG scheme. The same asymptotic forms apply both for systems with standard Heisenberg exchange and for certain multi-spin couplings leading to spontaneous dimerization in the clean system. We show that the logarithmic corrections arise in the valence-bond (singlet pair) basis from a contribution that can not be generated by the SDRG scheme. In the model with multi-spin couplings, where the clean system dimerizes spontaneously, random singlets form between spinons localized at domain walls in the presence of disorder. This amorphous valence-bond solid is asymptotically a random-singlet state and only differs from the random-exchange Heisenberg chain in its short-distance properties." @default.
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• W2300869610 date "2016-11-28" @default.
• W2300869610 modified "2023-10-18" @default.
• W2300869610 title "Properties of the random-singlet phase: From the disordered Heisenberg chain to an amorphous valence-bond solid" @default.
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• W2300869610 doi "https://doi.org/10.1103/physrevb.94.174442" @default.
• W2300869610 hasPublicationYear "2016" @default.
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