https://doi.org/10.1140/epjb/e2013-40122-4
Regular Article
Adiabatic quantum pumping in graphene with magnetic barriers
National Research Center “Kurchatov Institute”,
Kurchatov Sq. 1,
123182
Moscow,
Russia
a e-mail: evgeny.sg@gmail.com
Received:
13
February
2013
Received in final form:
20
March
2013
Published online:
7
May
2013
We study an adiabatic quantum pump effect in a two terminal graphene device with two oscillating square electric barriers and a stationary magnetic barrier using the scattering matrix approach. The model employs the low-energy Dirac approximation and incorporates the possible existence of a finite band gap in graphene spectrum. We show that in this case valley-polarized and pure valley currents can be pumped due to the valley symmetry breaking. For a δ-function magnetic barrier we present analytical expressions for bilinear total and valley pumping responses. These results are compared to numerical ones for a double δ-function, a square and a triple square magnetic barriers.
Key words: Mesoscopic and Nanoscale Systems
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2013