The Majumdar-Ghosh chain. Twofold ground state and elementary excitations
作者： W J Caspers , K M Emmett , W Magnus
DOI: 10.1088/0305-4470/17/13/020
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摘要: Recently it was proved that the Majumdar-Ghosh chain with Hamiltonian H=4 Sigma j=12NSj.Sj+1+2 j=12N Sj.Sj+2, Si+2N identical to Si, Si=1/2, has at least two ground states, in which spins are arranged nearest-neighbour singlet pairs. In this work is shown these states only states. Besides, a rapidly converging variational method given determine elementary excitations
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