Full text loading...
(Color online) (a) Optical micrograph of a microwave resonator (R) with an integrated quantum dot, (GND): ground plane of the resonator, (C): ohmic contact, (M): 2DEG mesa. (b) Magnified view of a coupling capacitor, location on the chip marked with rectangles in (a). (c) Enlarged view of the 2DEG mesa, location on the chip marked with a circle in (a). Edge of the mesa highlighted with a dashed line. (d) AFM picture of the measured quantum dot, realized on the 2DEG mesa. Source and drain contacts are labeled S and D, the plunger gate PG, and the left and right side gate LSG and RSG.
(Color online) (a) Charge stability diagram of the quantum dot without applied microwave power. White arrows indicate excited states. (b) Conductance through the quantum dot as a function of the PG voltage, for different microwave powers applied to the resonator in the vicinity of point A in (a). (c) Conductance change ΔG of the quantum dot as a function of the microwave frequency applied to the resonator. The resonator modes are numbered 1-4, and arrows indicate additional spurious modes.
(Color online) (a) Conductance measurement at Coulomb resonance A (assignment see Fig. 2a) versus frequency in the vicinity of the fundamental mode, for indicated microwave drive powers. (b) Maximum conductance change ΔG versus microwave power. (c) Resonator spectrum extracted from the dot conductance signal (blue dots) fitted with a Lorentzian line shape (green line). The dark circles are from a network analyzer measurement and are fitted with a Lorentzian line shape as well (red curve). The two curves are offset for clarity.
Article metrics loading...