Volume 35, Number 2, July II 1996
|Page(s)||151 - 152|
|Section||Cross-disciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Comment on “Quantum coherence in an exactly solvable one-dimensional model with defects”
B. I. Verkin Institute for Low Temperature Physics and
Engineering of the National Ukrainian Academy of Sciences - 47, Lenin ave.,
Kharkov, 310164, Ukraine
2 Institute of Theoretical Physics, Chalmers University of Technology and Göteborg University - S-412 96, Göteborg, Sweden
Accepted: 23 May 1996
In a recent paper by Schmitteckert et al., an exactly solvable XXZ chain with defects was studied. We here point out that, for this type of model, the critical exponents for the asymptotic correlation functions are insensitive to the presence of defects. Also, the defects do not enhance the persistent current of the equivalent fermionic model, contrary to a claim by Schmitteckert et al.
PACS: 71.27.+a – Strongly correlated electron systems / 71.30.+h – Metal-insulator transitions / 75.10.Jm – Quantized spin models
© EDP Sciences, 1996
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