Login | Register

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

[thumbnail of Vasilopoulos_JPhys_2011.pdf]
Preview
Text (application/pdf)
Vasilopoulos_JPhys_2011.pdf - Accepted Version
676kB

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

References:

[1] Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y, Dubonos S V, Grigorieva I V and Firsov A A 2004 Science 306 666

[2] Novoselov K S, Geim A K, Morozov S V, Jiang D, Katsnelson M I, Grigorieva I V, Dubonos S V and Firsov A A 2005 Nature 438 197

[3] Zhang Y, Tan Y-W, Stormer H L and Kim P 2005 Nature 438 201

[4] Barbier M, Peeters F M, Vasilopoulos P and Pereira J M Jr 2008 Phys. Rev. B 77 115446

[5] Neto A H C, Guinea F, Peres N M R, Novoselov K S and Geim A K 2009 Rev. Mod. Phys. 81 109

[6] Leenaerts O, Partoens B and Peeters F M 2008 Appl. Phys. Lett. 93 193107

[7] Ponomarenko L A, Schedin F, Katsnelson M I, Yang R, Hill E W, Novoselov K S and Geim A K 2008 Science 320 356

Stampfer C, Schurtenberger E, Molitor F, Guttinger J, Ihn T and Ensslin K 2009 Nano Lett. 8 2378

[8] Raoux A, Polini M, Asgari R, Hamilton A R, Fazio R and MacDonald A H 2010 Phys. Rev. B 81 073407

[9] Concha A and Tešanović Z 2010 Phys. Rev. B 82 033413

[10] Peres N M R 2009 J. Phys.: Condens. Matter 21 095501
IOP Article Juan F, Cortijo A and Vozmediano M A H 2007 Phys. Rev. B 76 165409

[11] Tapasztó L, Dobrik G, Nemes-Incze P, Vertesy G, Lambin Ph and Biró L P 2008 Phys. Rev. B 78 233407

[12] Gibertini M, Singha A, Pellegrini V, Polini M, Vignale G, Pinczuk A, Pfeiffer L N and West K W 2009 Phys. Rev. B 79 241406(R)

[13] Park C-H, Yang L, Son Y-W, Cohen M L and Louie S G 2008 Nat. Phys. 4 213

[14] Park C-H, Son Y-W, Yang L, Cohen M L and Louie S G 2008 Nano Lett. 8 2920

[15] Brey L and Fertig H A 2009 Phys. Rev. Lett. 103 046809

[16] Ho J H, Chiu Y H, Tsai S J and Lin M F 2009 Phys. Rev. B 79 115427

[17] Barbier M, Vasilopoulos P and Peeters F M 2010 Phil. Trans. R. Soc. A 368 5499

[18] Chen X, Tao J-W and Ban Y 2011 Eur. Phys. J. B 70 203 (arXiv:1004.0350v1 [cond-mat])

[19] Merzbacher E 1998 Quantum Mechanics (New York: Wiley)

[20] Pereira J M Jr, Vasilopoulos P and Peeters F M 2007 Appl. Phys. Lett. 90 132122

[21] Wang L-G and Zhu S-Y 2010 Phys. Rev. B 81 205444

[22] Barbier M, Vasilopoulos P and Peeters F M 2010 Phys. Rev. B 81 075438
All items in Spectrum are protected by copyright, with all rights reserved. The use of items is governed by Spectrum's terms of access.

Repository Staff Only: item control page

Downloads per month over past year

Research related to the current document (at the CORE website)
- Research related to the current document (at the CORE website)
Back to top Back to top