Comment on "Coherent Ratchets in Driven Bose-Einstein Condensates"

Details Comment on "Coherent Ratchets in Driven Bose-Einstein Condensates" Comment on "Coherent Ratchets in Driven Bose-Einstein Condensates"

2009-12-18

arxiv.org/abs/0912.3667v3

Phys. Rev. Lett. 104, 228901 (2010)

Physics

Condensed Matter

Quantum Gases

revised version

Scientific paper

10.1103/PhysRevLett.104.228901

C. E. Creffield and F. Sols (Phys. Rev. Lett. 103, 200601 (2009)) recently
reported finite, directed time-averaged ratchet current, for a noninteracting
quantum particle in a periodic potential even when time-reversal symmetry
holds. As we explain in this Comment, this result is incorrect, that is,
time-reversal symmetry implies a vanishing current.

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