The Majumdar-Ghosh chain. Twofold ground state and elementary excitations

Caspers, W.J. and Emmett, K.M. and Magnus, W. (1984) The Majumdar-Ghosh chain. Twofold ground state and elementary excitations. Journal of Physics A: Mathematical and General, 17 (13). p. 2687. ISSN 1751-8113

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Abstract:	Recently it was proved that the Majumdar-Ghosh chain with the Hamiltonian H=4 Sigma j=12NSj.Sj+1+2 Sigma j=12N Sj.Sj+2, Si+2N identical to Si, Si=1/2, has at least two ground states, in which the spins are arranged in nearest-neighbour singlet pairs. In this work it is shown that these two states are the only ground states. Besides, a rapidly converging variational method is given to determine the elementary excitations
Item Type:	Article
Copyright:	© 1984 Institute of Physics
Link to this item:	http://purl.utwente.nl/publications/60587
Official URL:	http://dx.doi.org/10.1088/0305-4470/17/13/020
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