Comment on "Spin Transport properties of the quantum one-dimensional non-linear sigma model"

Details Comment on "Spin Transport properties of the quantum one-dimensional non-linear sigma model" Comment on "Spin Transport properties of the quantum one-dimensional non-linear sigma model"

1999-06-03

arxiv.org/abs/cond-mat/9906054v1

Journal of the Physical Society of Japan 69, 2712 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

10.1143/JPSJ.69.2712

In a recent preprint (cond-mat/9905415), Fujimoto has used the Bethe ansatz to compute the finite temperature, zero frequency Drude weight of spin transport in the quantum O(3) non-linear sigma model in a magnetic field $H \neq 0$. We show here that, contrary to his claims, the results are in accord with earlier semiclassical results (Sachdev and Damle, cond-mat/9610115). We also comment on his 1/N expansion, and show that it does not properly describe the long-time correlations.

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