Krstajić, P M and Vasilopoulos, P. (2011) Ballistic transport through graphene nanostructures of velocity and potential barriers. Journal of Physics: Condensed Matter, 23 (13). p. 135302. ISSN 0953-8984
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Official URL: http://dx.doi.org/10.1088/0953-8984/23/13/135302
Abstract
We investigate the electronic properties of graphene nanostructures when the Fermi velocity and the electrostatic potential vary in space. First, we consider the transmission T and conductance G through single and double barriers. We show that G for velocity barriers differs markedly from that for potential barriers for energies below the height of the latter and it exhibits periodic oscillations as a function of the energy for strong velocity modulation. Special attention is given to superlattices (SLs). It is shown that an applied bias can efficiently widen or shrink the allowed minibands of velocity-modulated SLs. The spectrum in the Kronig–Penney limit is periodic in the strength of the barriers. Collimation of an electron beam incident on an SL with velocity and potential barriers is present but it disappears when the potential barriers are absent. The number of additional Dirac points may change considerably if barriers and wells have sufficiently different Fermi velocities.
| Divisions: | Concordia University > Faculty of Arts and Science > Physics |
|---|---|
| Item Type: | Article |
| Refereed: | Yes |
| Authors: | Krstajić, P M and Vasilopoulos, P. |
| Journal or Publication: | Journal of Physics: Condensed Matter |
| Date: | 6 April 2011 |
| Digital Object Identifier (DOI): | 10.1088/0953-8984/23/13/135302 |
| Keywords: | PACS: 73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems 73.63.Bd Nanocrystalline materials 73.23.Ad Ballistic transport 72.80.Rj Fullerenes and related materials Subjects: Condensed matter: electrical, magnetic and optical Surfaces, interfaces and thin films Nanoscale science and low-D systems |
| ID Code: | 7355 |
| Deposited By: | Danielle Dennie |
| Deposited On: | 19 Apr 2011 19:48 |
| Last Modified: | 18 Jan 2018 17:30 |
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