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PGI-Kolloquium
 
     

Semiconductor and Graphene Quantum Dots

Prof. Dr. Pawel Hawrylak, Quantum Theory Group, Emerging Technologies Division, National Research Council of Canada, Ottawa, Canada

begin
15.Apr.2013 11:00
venue
PGI-Hörsaal

Abstract

We review progress in theory and experiments on semiconductor and graphene quantum dots with potential applications in nanoelectronics, nanospintronics, nanophotonics and quantum information processing. We describe lateral quantum dot molecules with controlled electron numbers in each dot and discuss potential use of such molecules as building blocks of a field effect transistor with a macroscopic quantum state, of a coded qubit, GHZ and topological phases state generator.

We next turn to hybrid systems of self-assembled semiconductor quantum dots containing single magnetic impurities. Such impurities can be thought of as an atomic limit of quantum memory directly integrated into a semiconductor host.

Finally, we describe one-atom-thick semiconductor quantum dots made of graphene. We show that their electronic, optical and magnetic properties can be engineered by the size, shape, type of edge and number of layers. We focus on their optical and magnetic properties, and their control with external gate, electric field and photons. The possibility of realizing a fully integrated, carbon-only quantum circuit will be discussed.

Contact

Prof. Dr. Stefan Blügel
Phone: +49 2461 61-4249
Fax: +49 2461 61-2850
email: s.bluegel@fz-juelich.de

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