Abstract
The dynamics of charged interstitials moving in a tight-binding lattice is studied at very low temperatures. The diffusion coefficient and the nonlinear mobility are shown to be strongly affected by the interaction with the conduction electrons. Recent results valid in order Δ2 where Δ is the effective tunnel matrix element are extended to all orders of Δ2. Exact results are obtained in analytical form in the case of weak damping K≪1 and for K=1/2 where K is the dimensionless defect-electron coupling strength introduced by Kondo.
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