Volume 95, Number 1, July 2011
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 June 2011|
Electronic Raman signatures of valley polarization, shell filling in graphene quantum dots
Department of Physics and Astronomy, Georgia State University - Atlanta, GA 30303, USA
2 Department of Physics and Astronomy, University of Manitoba - Winnipeg, Canada R3T 2N2
Accepted: 16 May 2011
Our theoretical studies of inelastic light scattering from few-electron graphene quantum dots indicate that the electronic Raman spectrum is governed both by the inter-electron Coulomb interaction and single-particle excitations. The spectral features depend on the number of electrons in the quantum dot (QD) and importantly, on the valley polarization. A closed-shell QD shows different properties in polarized and depolarized geometries. The intensity of the polarized Raman peaks is suppressed for closed-shell systems. We also show how Raman spectroscopy in graphene quantum dots can probe both single-particle and collective many-particle charge-density–type excitations.
PACS: 78.67.Hc – Quantum dots / 73.22.Pr – Electronic structure of graphene / 78.67.Wj – Optical properties of graphene
© EPLA, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.