Abstract
A microscopic theory is presented of stress-assisted fluctuational breakaway of dislocation kinks from pinning centers. It is shown that a polaron lattice distortion near a pinned kink essentially affects the magnitude of energy fluctuation required to activate a jump over the pinning barrier. The effect of quantum lattice fluctuations on the low-temperature depinning rate is analyzed. The role played by the kink geometric width in depinning phenomenon is disclosed.
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