Normal transport properties for a classical particle coupled to a non-Ohmic bath

Details Normal transport properties for a classical particle coupled to a non-Ohmic bath Normal transport properties for a classical particle coupled to a non-Ohmic bath

2008-02-05

arxiv.org/abs/0802.0592v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1007/s10955-008-9590-3

We study the Hamiltonian motion of an ensemble of unconfined classical particles driven by an external field F through a translationally-invariant, thermal array of monochromatic Einstein oscillators. The system does not sustain a stationary state, because the oscillators cannot effectively absorb the energy of high speed particles. We nonetheless show that the system has at all positive temperatures a well-defined low-field mobility over macroscopic time scales of order exp(-c/F). The mobility is independent of F at low fields, and related to the zero-field diffusion constant D through the Einstein relation. The system therefore exhibits normal transport even though the bath obviously has a discrete frequency spectrum (it is simply monochromatic) and is therefore highly non-Ohmic. Such features are usually associated with anomalous transport properties.

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