| Issue |
Europhys. Lett.
Volume 54, Number 1, April 2001
|
|
|---|---|---|
| Page(s) | 1 - 6 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i2001-00274-6 | |
| Published online | 01 December 2003 | |
Ising model for a Brownian donkey
Limburgs Universitair Centrum - B-3590 Diepenbeek, Belgium
Received:
20
November
2000
Accepted:
24
January
2001
We introduce a thermal engine consisting of N interacting Brownian
particles moving in a periodic potential, featuring an alternation of
hot and cold symmetric peaks. A discretized Ising-like version is
solved analytically. In response to an external force, absolute
negative mobility is observed for 
. For 
a nonequilibrium phase transition takes place with a
spontaneous symmetry breaking entailing the appearance of a current in
the absence of an external force.
PACS: 02.50.-r – Probability theory, stochastic processes, and statistics / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 05.60.-k – Transport processes
© EDP Sciences, 2001
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