Two- and One-Dimensional Honeycomb Structures of Silicon and Germanium

S. Cahangirov, M. Topsakal, E. Aktürk, H. Şahin, and S. Ciraci
Phys. Rev. Lett. 102, 236804 – Published 12 June 2009

Abstract

First-principles calculations of structure optimization, phonon modes, and finite temperature molecular dynamics predict that silicon and germanium can have stable, two-dimensional, low-buckled, honeycomb structures. Similar to graphene, these puckered structures are ambipolar and their charge carriers can behave like a massless Dirac fermion due to their π and π* bands which are crossed linearly at the Fermi level. In addition to these fundamental properties, bare and hydrogen passivated nanoribbons of Si and Ge show remarkable electronic and magnetic properties, which are size and orientation dependent. These properties offer interesting alternatives for the engineering of diverse nanodevices.

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  • Received 27 November 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.236804

©2009 American Physical Society

Authors & Affiliations

S. Cahangirov1, M. Topsakal1, E. Aktürk1, H. Şahin1, and S. Ciraci1,2,*

  • 1UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
  • 2Department of Physics, Bilkent University, Ankara 06800, Turkey

  • *ciraci@fen.bilkent.edu.tr

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Vol. 102, Iss. 23 — 12 June 2009

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