Volume 88, Number 5, December 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 December 2009|
Graphene armchair nanoribbon single-electron transistors: The peculiar influence of end states
Theoretische Physik, Universität Regensburg - 93040 Regensburg, Germany, EU
2 Fraunhofer IWM - Wöhlerstrae 11, 79108 Freiburg, Germany, EU
Corresponding author: Sonja.Koller@physik.uni-regensburg.de
Accepted: 9 November 2009
We present a microscopic theory for interacting graphene armchair nanoribbon quantum dots. Long-range interaction processes are responsible for Coulomb blockade and spin-charge separation. Short-range ones, arising from the underlying honeycomb lattice of graphene smear the spin-charge separation and induce exchange correlations between bulk electrons —delocalized on the ribbon— and single electrons localized at the two ends. As a consequence, entangled end-bulk states where the bulk spin is no longer a conserved quantity occur. Entanglement's signature is the occurrence of negative differential conductance effects in a fully symmetric set-up due to symmetry-forbidden transitions.
PACS: 73.23.Hk – Coulomb blockade; single-electron tunneling / 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) / 73.63.-b – Electronic transport in nanoscale materials and structures
© EPLA, 2009
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