Abstract
We have studied the magnetoconductance of quantum dots with triangular symmetry and areas down to made in a high mobility two-dimensional electron gas embedded in a heterostructure. Semiclassical simulations show that the gross features in the measured magnetoconductance are caused by ballistic effects. Below 1 K we observe a strong periodic oscillation, which may be explained in terms of the Aharanov-Bohm flux quantization through the area of a single classical periodic orbit. From a numerical and analytical analysis of possible trajectories in hard- and soft-walled potentials, we identify this periodic orbit as the enscribed triangle. Contrary to other recent experiments, this orbit is not accessible by classical processes for the incoming collimated beam.
- Received 20 October 1997
DOI:https://doi.org/10.1103/PhysRevB.57.15408
©1998 American Physical Society