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Difference between the conductance and the nonoscillating background as a function of for , (straight line) and , (dashed line). The Aharonov-Bohm oscillations with a period of are clearly visible in the first situation but vanish in the other one. Inset: an atomic force microscope image of the device. The quantum dots that formed in the structure are marked. The middle of the oxide lines is traced in grey for clarity. The areas labeled , , and G1 can be combined and used as one single gate .
(a) The conductance through the quantum ring in dependence of the applied gate voltages. (b) The positions of the Coulomb blockade lines visible in the spectrum shown in (a). The dashed boxes mark the regions corresponding to the depictions in Fig. 3. They are labeled with the numbers of the dots whose lines cross inside of their area. Each set of lines is labeled with respect to the corresponding quantum dot.
(a) A section of the conductance plot where the Coulomb lines of dots I and II cross each other. To emphasize the features, only the difference from the background is shown. One of the anticrossings is traced. (b) Part of the region where the blockade lines of dots II and III meet. One anticrossing is marked. (c) Part of the region where the blockade lines of all three dots meet. Here, again, a background has been removed. For each dot, one line is marked and labeled. Additionally, one of the crossing patterns indicating the presence of triple dot physics is traced.
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