Hopf Term for a Two-Dimensional Electron Gas: Comment to Reply to Comment

Details Hopf Term for a Two-Dimensional Electron Gas: Comment to Reply to Comment Hopf Term for a Two-Dimensional Electron Gas: Comment to Reply to Comment

1997-11-10

arxiv.org/abs/cond-mat/9711076v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTex file, 1 page, Comment to Reply by W. Apel and Yu.A. Bychkov, Phys. Rev. Lett. 79 (1997) 3792

Scientific paper

In our Comment (G.E. Volovik and V.M. Yakovenko, Phys. Rev. Lett. 79 (1997) 3792) to the Letter by W. Apel and Yu.A. Bychkov (Phys. Rev. Lett. 78 (1997) 2188) we questioned the derivation of the Hopf term in the hydrodynamic action for the Skyrmion dynamics in QHE. Our main argument was that the description in terms of Euler angles used by Apel and Bychkov was potentially dangerous since these angles were ill-defined. The Reply (W. Apel and Yu.A. Bychkov, Phys. Rev. Lett. 79 (1997) 3792) to our Comment confirmed our apprehension.

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