Li Han, Yong Guo
Published 2007-09-17, updated 2007-10-05Version 2
We show in this comment that the results obtained in a recent work by Yi et al. [Phys. Rev. Lett. 92, 150406 (2004)] are quantitatively not correct and the proposed subsystem Berry phase is not well-defined.
Comments: 1 page, 1 figure, submitted to Physical Review Letters
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