Graphene armchair nanoribbon single-electron transistors: The peculiar influence of end states
| Autor: | Koller, Sonja, Mayrhofer, Leonhard, Grifoni, Milena |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Europhys. Lett. 88, 57001 (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1209/0295-5075/88/57001 |
| Popis: | 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. Comment: 6 pages, 7 figures; version submitted to EPL |
| Databáze: | arXiv |
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