Quantum Diffusion
Abstract
Basic ideas and results which characterize quantum diffusion of defects in quantum crystals like solid helium as a new phenomenon are presented. Quantum effects in such media lead to a delocalization of point defects (vacancies, impurities etc.) and they turn into quasiparticles of a new type -- defectons, which are characterized not by their position in the crystal lattice but by their quasimomentum and dispersion law. Defecton-defecton and defecton-phonon scattering are considered and an interpolation formula for the diffusion coefficient valid in all interesting temperature and concentration regions is presented. A comparison with the experimental data is made. Some alternative points of view are discussed in detail and the inconsistency of the Kisvarsanyi-Sullivan theory is shown.
Cite
@article{arxiv.cond-mat/0310283,
title = {Quantum Diffusion},
author = {Dimitar I. Pushkarov},
journal= {arXiv preprint arXiv:cond-mat/0310283},
year = {2009}
}
Comments
14 pages, 8 figures