I. Zailer et al., PHASE COHERENCE, INTERFERENCE, AND CONDUCTANCE QUANTIZATION IN A CONFINED 2-DIMENSIONAL HOLE GAS, Physical review. B, Condensed matter, 49(7), 1994, pp. 5101-5104
A system of two parallel constrictions in a two-dimensional hole gas h
as been studied. At zero magnetic-field conductance quantization is ob
served through the individual constrictions. At high magnetic fields A
haronov-Bohm oscillations result from resonant tunneling through state
s encircling the repulsive potential between the constrictions. The os
cillations demonstrate directly phase-coherent transport of holes.