Impurity effects in graphene
Department of Physics, Faculty of Sciences, Ankara University, 06100 Tandoğan, Ankara, Turkey
Received: 9 February 2012
Received in final form: 25 April 2012
Published online: 27 June 2012
We study the effects of impurities on the electronic properties of graphene. The tight-binding Hamiltonian with impurities has been diagonalized by a series of canonical transformations to obtain energy dispersions. Impurity effects on energy is observed as a band gap opening in donor type impurities, whereas acceptor type impurities do not create a gap. However the linear dispersions near the Dirac point turn to quadratic form for both types of impurities. Density of states are also calculated analytically.
Key words: Mesoscopic and Nanoscale Systems
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2012