Aharonov–Bohm effect and one-dimensional ballistic transport through two independent parallel channels

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Abstract
We have developed a new technique to contact a submicrometer metal dot gate independently of surrounding gates. With this we have made two ballistic channels in parallel on a GaAs-AlGaAs heterostructure. Independent control over all the gates allows unprecedented flexibility to adjust both the size of the dot and the widths of the channels. In a perpendicular magnetic field we can obtain extremely large Aharonov–Bohm oscillations and a double-frequency oscillation indicative of edge state charging in an open system. At low magnetic fields we see no evidence for any interaction between the one-dimensional subbands in the two channels.