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A tunable three-lead double quantum dot with a resorcinarene spacer

Fleischer, M; Panteleit, F; Schefzyk, DJ; Ritchie, DA; Pepper, M; Wharam, DA; (2009) A tunable three-lead double quantum dot with a resorcinarene spacer. SEMICOND SCI TECH , 24 (2) , Article 025010. 10.1088/0268-1242/24/2/025010.

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Abstract

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[4] 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.

Type:Article
Title:A tunable three-lead double quantum dot with a resorcinarene spacer
DOI:10.1088/0268-1242/24/2/025010
Keywords:POINT-CONTACTS, FABRICATION
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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