A tunable three-lead double quantum dot with a resorcinarene spacer.
SEMICOND SCI TECH
, Article 025010. 10.1088/0268-1242/24/2/025010.
Configurations of multiple quantum dots in the two-dimensional electron gas of a GaAs-AlGaAs heterostructure are of considerable fundamental interest. In this paper, a fabrication process is presented which is scalable, forms robust structures, requires a minimum number of leads and enables access to the active device areas. A stable tunable double dot connected in series is formed by only three metallic gates, using methylcalix resorcinarene as a dielectric spacer. A capacitance model for dot formation through screening by the spacer is presented, as well as low-temperature measurements showing the transition from a single to a double dot with varying interdot couplings. The method can easily be extended to the fabrication of multiple dots and more complex geometries.
|Title:||A tunable three-lead double quantum dot with a resorcinarene spacer|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
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