Defect-controlled electronic transport in single, bilayer, and N-doped graphene: Theory
2010 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 81, no 24, 245405- p.Article in journal (Refereed) Published
We report on a theoretical study of the electronic-structure and transport properties of single and bilayer graphene with vacancy defects, as well as N-doped graphene. The theory is based on first-principles calculations as well as model investigations in terms of real-space Green's functions. We show that increasing the defect concentration increases drastically the conductivity in the limit of zero applied gate voltage, by establishing carriers in originally carrier-free graphene, a fact which is in agreement with recent observations. We calculate the amount of defects needed for a transition from a nonconducting to a conducting regime (i.e., a metal-insulator transition) and establish the threshold of the defect concentration where the increase in impurity scattering dominates over the increase in carrier-induced conductivity.
Place, publisher, year, edition, pages
2010. Vol. 81, no 24, 245405- p.
IdentifiersURN: urn:nbn:se:uu:diva-136075DOI: 10.1103/PhysRevB.81.245405ISI: 000278301300007OAI: oai:DiVA.org:uu-136075DiVA: diva2:376152