Electrostatically defined serial triple quantum dot charged with few electrons
Physical Review B2007Vol. 76(7)
Citations Over TimeTop 1% of 2007 papers
D. Schröer, Andrew D. Greentree, Louis Gaudreau, K. Eberl, Lloyd C. L. Hollenberg, J. P. Kotthaus, Stefan Ludwig
Abstract
A serial triple quantum dot (TQD) electrostatically defined in a $\mathrm{Ga}\mathrm{As}∕\mathrm{Al}\mathrm{Ga}\mathrm{As}$ 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.
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