Dresden 2009 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 26: Transport: Graphene and Carbon Nanotubes
TT 26.17: Talk
Wednesday, March 25, 2009, 18:45–19:00, HSZ 03
Few electrons in magnetic graphene quantum dots — •Wolfgang Häusler1,2 and Reinhold Egger1 — 1Institut für Theoretische Physik, Heinrich-Heine-Universität, D-40225 Düsseldorf, Germany — 2Physikalisches Institut, Albert-Ludwigs-Universität, D-79104 Freiburg, Germany
We consider inhomogeneous magnetic fields to design quantum islands on graphene structures. Following the well known case of semiconducting quantum dots we investigate two interacting electrons. Without further consideration the Dirac Hamiltonian is ill defined for more than one particle. We solve this issue by projecting on positive energy states as physically justified by the presence of a chemical potential. Results of relatively demanding numerical diagonalizations will be presented for artificial graphene helium.