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• W2086274322 abstract "We investigate the phase diagram of antiferromagnetic spin ladders with additional exchange interactions on diagonal bonds by variational and numerical methods. These generalized spin ladders interpolate smoothly between the chain with competing nn and nnn interactions, the chain with alternating exchange and the antiferromagnetic (AF) S = 1 chain. The Majumdar - Ghosh ground states are formulated as matrix product states and are shown to exhibit the same type of hidden order as the AF S = 1 chain. Generalized matrix product states are used for a variational calculation of the ground state energy and the spin and string correlation functions. Numerical (Lanczos) calculations of the energies of the ground state and of the low-lying excited states are performed, and compare reasonably with the variational approach. Our results support the hypothesis that the dimer and Majumdar - Ghosh points are in the same phase as the AF S = 1 chain." @default.
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• W2086274322 date "1996-09-16" @default.
• W2086274322 modified "2023-10-13" @default.
• W2086274322 title "The phase diagram and hidden order for generalized spin ladders" @default.
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• W2086274322 doi "https://doi.org/10.1088/0953-8984/8/38/018" @default.
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