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Experimental Quantum Transport in Carbon Nanotubes: Josephson Quantum Dot Junctions and Double Quantum Dots

PhD defence by Henrik Ingerslev Jørgensen, Nano-Science Center.

Evaluation committee:
Andrew Briggs (Oxford)
Seigo Tarucha (Tokyo)
Mogens T. Levinsen (Copenhagen, Chairman)

Supervisor:
Poul Erik Lindelof (Copenhagen)

Abstract
The talk presents experimental work on two types of nano-scale devices, called Josephson quantum dot junctions and double quantum dots. Both types of devices are experimentally fabricated using carbon nanotubes and lithography techniques. By placing two superconductors on top of a carbon nanotube, an artificial atom (quantum dot) is formed between the superconductors. Such junctions, called Josephson quantum dot junctions, enable study of e.g. supercurrent through single discrete quantum channels. Quantum dots in carbon nanotubes can also be created by means of a number of gates. By gate-defining two such quantum dots in one carbon nanotube an artificial molecule (two artificial atoms) are created, where shell structure, molecular orbitals, and spin states (singlets and triplets) are explored.

(Thesis is available at: http://www.fys.ku.dk/~hij)