Akhmerov, A. R. and Bardarson, J. H. and Rycerz, A. and Beenakker, C. W. J. (2008) Theory of the valley-valve effect in graphene nanoribbons. PHYSICAL REVIEW B, 77 (20): 205416. ISSN 1098-0121, 1550-235X
Full text not available from this repository.Abstract
A potential step in a graphene nanoribbon with zigzag edges is shown to be an intrinsic source of intervalley scattering-no matter how smooth the step is on the scale of the lattice constant a. The valleys are coupled by a pair of localized states at the opposite edges, which act as an attractor and/or repellor for the edge states propagating in valley K/K'. The relative displacement A along the ribbon of the localized states determines the conductance G. Our result G = (e(2)/h)[1-cos(N pi+2 pi Delta/3a)] explains why the "valley-valve" effect (the blocking of the current by a p-n junction) depends on the parity of the number N of carbon atoms across the ribbon.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRONICS; RIBBONS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 Nov 2020 14:03 |
| Last Modified: | 03 Nov 2020 14:03 |
| URI: | https://pred.uni-regensburg.de/id/eprint/30982 |
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