Abstract
Coupled quantum dots in series have been realized in two dimensional electron gas (2DEG) in GaAs/AlGaAs heterostructures using the surface gate, and transport measurements have been performed at the dilution refrigerator temperature. The electrical transport was found to be determined by the Coulomb blockade and the resonant tunneling. The energy width of the resonant peak can be smaller than the thermal energy when two dots are sufficiently isolated. The charge stability diagram, by changing two gates attached to each dot, was measured for weak and strong coupling conditions. The width of the current resonant peak changed significantly as the coupling was increased, while the capacitive coupling did not change so much. The experimental result was analyzed using a simple capacitance model.
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