Abstract
The ballistic motion of electrons is studied in an array of open quantum dots. The submicron dots are fabricated by electron beam lithography and dry etching techniques. Pronounced oscillations are observed in the magnetoresistance which can be understood in terms of the commensurability effect between the ballistic trajectories and the geometry of the circular cavity or the internal magnetic focusing. By breaking the symmetry of the entrance/exit openings, or by inducing a large antidot at the center of the cavity, the commensurability effect disappears.
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