Energy Flow Puzzle of Soliton Ratchets

Details Energy Flow Puzzle of Soliton Ratchets Energy Flow Puzzle of Soliton Ratchets

2005-01-20

arxiv.org/abs/cond-mat/0501497v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures, submitted to PRL

Scientific paper

10.1209/epl/i2005-10235-7

We study the mechanism of directed energy transport for soliton ratchets. The energy flow appears due to the progressive motion of a soliton (kink) which is an energy carrier. However, the energy current formed by internal system deformations (the total field momentum) is zero. We solve the underlying puzzle by showing that the energy flow is realized via an {\it inhomogeneous} energy exchange between the system and the external ac driving. Internal kink modes are unambiguously shown to be crucial for that transport process to take place. We also discuss effects of spatial discretization and combination of ac and dc external drivings.

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