Electrostatically defined serial triple quantum dot charged with few electrons

Schröer, D.; Greentree, A. D.; Gaudreau, L.; Eberl, K.; Hollenberg, L. C. L.; Kotthaus, J. P.; Ludwig, S.

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Electrostatically defined serial triple quantum dot charged with few electrons

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Eberl, K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Schröer, D., Greentree, A. D., Gaudreau, L., Eberl, K., Hollenberg, L. C. L., Kotthaus, J. P., et al. (2007). Electrostatically defined serial triple quantum dot charged with few electrons. Physical Review B, 76(7): 075306.

Cite as: https://hdl.handle.net/21.11116/0000-000E-B6EF-8

Abstract

A serial triple quantum dot (TQD) electrostatically defined in a GaAs/AlGaAs heterostructure is characterized by using a nearby quantum point contact as charge detector. Ground-state stability diagrams demonstrate control in the regime of few electrons charging the TQD. An electrostatic model is developed to determine the ground-state charge configurations of the TQD. Numerical calculations are compared with experimental results. In addition, the tunneling conductance through all three quantum dots in series is studied. Quantum cellular automata processes are identified, which are where charge reconfiguration between two dots occurs in response to the addition of an electron in the third dot.