Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 26: Transport: Graphene and Carbon Nanotubes
TT 26.8: Vortrag
Mittwoch, 25. März 2009, 16:15–16:30, HSZ 03
Tomonaga-Luttinger liquid parameters of magnetic waveguides in graphene — •W. Häusler1,2, A. De Martino1,3, T. K. Ghosh1,4, and R. Egger1 — 1Institut für Theoretische Physik, Heinrich-Heine-Universität, D-40225 Düsseldorf, Germany — 2Physikalisches Institut, Albert-Ludwigs-Universität, D-79104 Freiburg, Germany — 3Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany — 4Department of Physics, Indian Institute of Technology-Kanpur, Kanpur 208016, India
Electronic waveguides in graphene formed by counterpropagating snake states in suitable inhomogeneous magnetic fields are shown to constitute a realization of a Tomonaga-Luttinger liquid. Due to the spatial separation of the right- and left-moving snake states, this non-Fermi liquid state induced by electron-electron interactions is essentially unaffected by disorder. We calculate the interaction parameters accounting for the absence of Galilei invariance in this system, and thereby demonstrate that non-Fermi liquid effects are significant and tunable in realistic geometries.