AHARONOV-BOHM INTERFERENCE OF HOLES AT DISLOCATIONS IN LATTICE-MISMATCHED HETEROSTRUCTURES

We have succeeded in revealing Aharonov-Bohm type interference of hole s in macroscopic semiconductor sample containing an array of straight- line dislocations. This interference has been observed at helium tempe ratures as oscillations in the forward current flowing through p(+)-n junction of the lattice-mismatched GaAs1-xSbx/GaAs heterostructure whi le measured as a function of the magnetic field perpendicular to the c urrent. The oscillation cycles arise when a primary hole wave meeting the Read's cylinder of a misfit dislocation interferes with a wave whi ch circled completely round the cylinder.