Spin-dependent transport through interacting graphene armchair nanoribbons
| Autor: | Koller, Sonja, Mayrhofer, Leonhard, Grifoni, Milena |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | New Journal of Physics 12 (2010) 033038 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1367-2630/12/3/033038 |
| Popis: | We investigate spin effects in transport across fully interacting, finite size graphene armchair nanoribbons (ACNs) contacted to collinearly spin-polarized leads. In such systems, the presence of short ranged Coulomb interaction between bulk states and states localized at the ribbon ends leads to novel spin-dependent phenomena. Specifically, the total spin of the low energy many-body states is conserved during tunneling but that of the bulk and end states is not. As a consequence, in the single-electron regime, dominated by Coulomb blockade phenomena, we find pronounced negative differential conductance features for ACNs contacted to parallel polarized leads. These features are however absent for an anti-parallel contact configuration, which in turn leads within a certain gate and bias voltage region to a negative tunneling magneto-resistance. Moreover, we analyze the changes in the transport characteristics under the influence of an external magnetic field. Comment: 37 pages, 9 figures, 2 tables; revised published version |
| Databáze: | arXiv |
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