Scattering theory of current-induced forces in mesoscopic systems

Details Scattering theory of current-induced forces in mesoscopic systems Scattering theory of current-induced forces in mesoscopic systems

2011-03-24

arxiv.org/abs/1103.4809v2

Phys. Rev. Lett. 107, 036804 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 1 figure; v2: minor modifications

Scientific paper

10.1103/PhysRevLett.107.036804

We develop a scattering theory of current-induced forces exerted by the conduction electrons of a general mesoscopic conductor on slow "mechanical" degrees of freedom. Our theory describes the current-induced forces both in and out of equilibrium in terms of the scattering matrix of the phase-coherent conductor. Under general nonequilibrium conditions, the resulting mechanical Langevin dynamics is subject to both non-conservative and velocity-dependent Lorentz-like forces, in addition to (possibly negative) friction. We illustrate our results with a two-mode model inspired by hydrogen molecules in a break junction which exhibits limit-cycle dynamics of the mechanical modes.

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