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[16:00] MST colloquium
- Description:
- Speaker
Prof. Pawel Hawrylak
Affiliation
Emerging Technologies Division, National Research Council of Canada
Title
Optical properties of graphene quantum dots
Location
Department of Physics Bldg., Voutes, 3rd floor Seminar Room
Time
16:00
Language
English
Abstract
We briefly review electronic and optical properties of graphite, graphene and dichalgonides and discuss their strength and
shortcomings. We next discuss how one can engineer electronic, optical and magnetic properties of graphene by control of lateral size, character of the edge, sublattice symmetry, number of layers and carrier density. We describe gate controlled triangular graphene
quantum dots (TGQD) with broken sublattice symmetry and colloidal graphene quantum dots(CGQD). The broken sublattice symmery and zigzag edge in TGQDs leads to a shell of degenerate states at the Fermi level. The filling of this shell leads to nontrivial electronic, optical and magnetic properties controlled by e-e interactions. One of the examples include optical spin blockade and optical control of magnetization in carbon only material system . We next discuss optical properties of colloidal graphene quantum dots with emphasis on band edge exciton and valley polarization.
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February 2014
