  We measured Aharonov-Bohm resistance oscillations in a shallow
two-dimensional GaAs hole ring structure, defined by local anodic surface
oxidation. The amplitude of the oscillations is about 10% of the ring
resistance, the strongest seen in a hole system. In addition we observe
resistance oscillations as a function of front gate bias at zero magnetic
field. We discuss the results in light of spin interference in the ring and
possible applications to spintronics.
