Abstract
The hopping rate nu of heavy, positively charged particles (e.g. positive muons) in a type-I superlattice is calculated. The electron-electron and electron-charged-particle interactions are treated in the random-phase approximation. It is assumed that the charged particle is confined to the barrier regions between the quantum wells where there are no electrons, and hops between nearest-neighbour lattice sites R1, R2 only. It is shown that nu is an anisotropic function of R1 and R2. The contribution to nu due to particle-hole modes and plasmon excitations is obtained.
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