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

B. Li; D. Poletti; G. Benenti; G. Casati; P. Hanggi; S. Denisov; S. Flach

arxiv: 0912.3667 · v3 · submitted 2009-12-18 · ❄️ cond-mat.quant-gas

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

G. Benenti , G. Casati , S. Denisov , S. Flach , P. Hanggi , B. Li , D. Poletti This is my paper

classification ❄️ cond-mat.quant-gas

keywords commentcurrentsymmetrytime-reversalbose-einsteincoherentcondensatescreffield

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

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