Graphene quantum dots: Beyond a Dirac billiard

Florian Libisch, Christoph Stampfer, and Joachim Burgdörfer
Phys. Rev. B 79, 115423 – Published 17 March 2009

Abstract

We present realistic simulations of quantum confinement effects in phase-coherent graphene quantum dots with linear dimensions of 10–40 nm. We determine wave functions and energy-level statistics in the presence of disorder resulting from edge roughness, charge impurities, or short-ranged scatterers. Marked deviations from a simple Dirac billiard for massless fermions are found. We find a remarkably stable dependence of the nearest-neighbor level spacing on edge roughness suggesting that the roughness of fabricated devices can be possibly characterized by the distribution of measured Coulomb blockade peaks.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 20 August 2008

DOI:https://doi.org/10.1103/PhysRevB.79.115423

©2009 American Physical Society

Authors & Affiliations

Florian Libisch1, Christoph Stampfer2, and Joachim Burgdörfer1

  • 1Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10/136, A-1040 Vienna, Austria, European Union
  • 2Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 79, Iss. 11 — 15 March 2009

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×