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Scaling of excitations in dimerized and frustrated spin-1/2 chains (Articolo in rivista)
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- Label
- Scaling of excitations in dimerized and frustrated spin-1/2 chains (Articolo in rivista) (literal)
- Anno
- 2005-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1103/PhysRevB.72.172409 (literal)
- Alternative label
Controzzi, D.; Esposti Boschi, C.D.; Ortolani, F.; Pasini, S. (2005)
Scaling of excitations in dimerized and frustrated spin-1/2 chains
in Physical review. B, Condensed matter and materials physics; APS, American physical society, College Park, MD (Stati Uniti d'America)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Controzzi, D.; Esposti Boschi, C.D.; Ortolani, F.; Pasini, S. (literal)
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- International School for Advanced Studies, INFN, Via Beirut, 1, 34100 Trieste, Italy
CNR-INFM, Research Unit of Bologna, Viale Berti-Pichat, 6/2, 40127 Bologna, Italy
Physics Department, University of Bologna, INFN, Viale Berti-Pichat, 6/2, 40127 Bologna, Italy (literal)
- Titolo
- Scaling of excitations in dimerized and frustrated spin-1/2 chains (literal)
- Abstract
- We study the finite-size behavior of the low-lying excitations of spin-1/2 Heisenberg chains with dimerization and next-to-nearest neighbors interaction J(2). The numerical analysis, performed using density-matrix renormalization group, confirms previous exact diagonalization results and shows that, for different values of the dimerization parameter delta, the elementary triplet and singlet excitations present a clear scaling behavior in a wide range of l=L/xi (where L is the length of the chain and xi is the correlation length). At J(2)=J(2c), where no logarithmic corrections are present, we compare the numerical results with finite-size predictions for the sine-Gordon model obtained using Luscher's theory. For small delta we find a very good agreement for l greater than or similar to 4 or 7 depending on the excitation considered. (literal)
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