A ratchet for heat transport between identical reservoirs
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A one-dimensional periodic array of elastically colliding hard points, with a non-centrosymmetric unit cell, connected at its two ends to {\em identical but non-thermal} energy reservoirs, is shown to carry a sustained unidirectional energy current.
4 epsf figures, submitted to Phys Rev Lett., this version contains slightly modified references
4 epsf figures, submitted to Phys Rev Lett., this version contains slightly modified references