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

Abstract

We have succeeded in revealing Aharonov-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-x Sb 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.