Aharonov-Bohm Interference of Holes at Dislocations in Lattice-Mismatched Heterostructures

(Received 30 October 1996, accepted 27 January 1997)

Abstract
We have succeeded in revealing Ahaxonov-Bohm type interference of holes in macroscopic semiconductor sample containing an array of straight-line dislocations. This interference has been observed at helium temperatures as oscillations in the forward current flowing through p ⁺-n junction of the lattice-mismatched GaAs _1-xSb _x/GaAs heterostructure while measured as a function of the magnetic field perpendicular to the current. The oscillation cycles arise when a primary hole wave meeting the Read's cylinder of a misfit dislocation interferes with a wave which circled completely round the cylinder.