Quantum transport in graphene Hall bars - effects of vacancy disorder

Datum: 22 juni 2016

Locatie: University of Antwerp - Campus Groenenborger - Room U.241 - Groeneborgerlaan 171 - 2020 Antwerpen

Tijdstip: 16 - 17 uur

Organisatie / co-organisatie: Condensed Matter Theory

Korte beschrijving: CMT seminar presented by Marko Petrovic

Using the tight-binding model, we numerically study the influence of vacancy disorder on electron transport in graphene Hall bars in high magnetic fields.  Disorder, induced by random distributions of single vacancies, breaks the  graphene sublattice symmetry and creates vacancy localized states. These  states are observable in the bend resistance, as well as in the total DOS.  Their energy is proportional to the square root of the magnetic field, while their localization length is proportional to the cyclotron radius. We further  study how do these localized states change with the vacancy concentration and next nearest neighbor hopping.

Marko Petrovic, CMT group, UAntwerpen

Contact e-mail: lucian.covaci@uanwerpen.be

Url: http://cmt.uantwerpen.be