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Ballistic transport through graphene nanostructures of velocity and potential barriers

Title:

Ballistic transport through graphene nanostructures of velocity and potential barriers

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:06 April 2011
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 15:48
Last Modified:19 Apr 2011 15:48
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