Probing the electronic structure and optical response of a graphene quantum disk supported on monolayer graphene

Journal Article · Sun Jan 01 04:00:00 EST 2012 · Journal of Physics: Condensed Matter

DOI:https://doi.org/10.1088/0953-8984/24/31/314213· OSTI ID:1049931

Zhou, Wu ^[1]; Pennycook, Stephen J ^[2]; Idrobo Tapia, Juan C ^[2]

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1. Vanderbilt University
2. ORNL

In this paper, we show that a graphene quantum disk (GQD) can be generated on monolayer graphene via structural modification using the electron beam. The electronic structure and local optical responses of the GQD, supported on monolayer graphene, were probed with electron energy-loss spectrum imaging on an aberration-corrected scanning transmission electron microscope. We observe that for small GQD, {approx}1.3 nm in diameter, the electronic structure and optical response are governed by the dominating edge states, and are distinctly different from either monolayer graphene or double-layer graphene. Highly localized plasmon modes are generated at the GQD due to the confinement from the edge of the GQD in all directions. The highly localized optical response from GQDs could find use in designing nanoscale optoelectronic and plasmonic devices based on monolayer graphene.

• Research Organization: Oak Ridge National Laboratory (ORNL); Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1049931
• Journal Information: Journal of Physics: Condensed Matter, Journal Name: Journal of Physics: Condensed Matter Journal Issue: 31 Vol. 24; ISSN 0953-8984
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CONFINEMENT
EELS
ELECTRON BEAMS
ELECTRON MICROSCOPES
ELECTRONIC STRUCTURE
ELECTRONS
MODIFICATIONS
PLASMONS
STEM
graphene
plasmons