TL;DR
This paper introduces the concept of quantum diffusion of defects in quantum crystals like solid helium, describing defectons as quasiparticles and providing a comprehensive model for their diffusion behavior.
Contribution
It presents a new theoretical framework for quantum defect diffusion, including defecton quasiparticles, scattering mechanisms, and an interpolation formula for diffusion coefficients.
Findings
Defectons are characterized by quasimomentum and dispersion law.
An interpolation formula for diffusion coefficient is proposed.
Comparison with experimental data supports the theory.
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.
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