A widely tunable few electron droplet

Details A widely tunable few electron droplet A widely tunable few electron droplet

2006-07-10

arxiv.org/abs/cond-mat/0607248v3

Journal of Physics: Condensed Matter 19, 236202 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 5 figures

Scientific paper

10.1088/0953-8984/19/23/236202

Quasi-static transport measurements are employed to characterize a few electron quantum dot electrostatically defined in a GaAs/AlGaAs heterostructure. The gate geometry allows observations on one and the same electron droplet within a wide range of coupling strengths to the leads. The weak coupling regime is described by discrete quantum states. At strong interaction with the leads Kondo phenomena are observed as a function of a magnetic field. By varying gate voltages the electron droplet can, in addition, be distorted into a double quantum dot with a strong interdot tunnel coupling while keeping track of the number of trapped electrons.

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