Aharonov-Bohm-type oscillations in antidot lattices in the quantum Hall regime

Abstract

Various aspects of the Aharonov--Bohm(AB)-type effects in antidot lattices in the quantum Hall (QH) regime are studied. Features associated with spin-resolved edge channels formed around the antidots are observed in the vicinity of the $\ensuremath{\nu}=2$ [$\ensuremath{\nu}$ being the Landau level (LL) filling factor] QH state. AB-type oscillations with anomalous periodicities lying between $h∕2e$ and $h∕3e$ are observed on the higher field side of the $\ensuremath{\nu}=2$ QH state. The phenomenon is interpreted basically as $h∕2e$ oscillation reported earlier for single antidot systems, but with important modification specific to the antidot array system. By tuning the negative front gate bias, different regimes of relative importance of the intra- and inter-LL tunnelings are explored.