Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: Graphene I: Structure and Dynamics
O 7.10: Vortrag
Montag, 7. März 2016, 13:00–13:15, H24
Magnetically confined quantum dots in graphene revealed by scanning tunneling spectroscopy — •Nils Freitag1, Peter Nemes-Incze1, Larisa Chizova2, Colin R. Woods3, Roman V. Gorbachev3, Yang Cao3, Andre K. Geim3, Kostya S. Novoselov3, Florian Libisch2, and Markus Morgenstern1 — 1II. Institute of Physics B, RWTH Aachen, Otto-Blumenthal Street, 52074 Aachen, Germany — 2Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria — 3School of Physics & Astronomy, University of Manchester, Manchester, United Kingdom
Confining graphene's chiral massless charge carriers by carving out nano-structures to circumvent Klein-tunneling suffers from disordered edges, impeding the control of the quasi-relativistic particles. Here, we use the electrostatic potential of an STM tip in combination with an homogeneous magnetic field to confine electrons in graphene without edges[1]. The confinement becomes visible as a fourfold charging sequence at B>2T, as expected from valley and spin degeneracy. Up to 40 charging peaks are observed in the hole and electron sector with charging energies of 5-10meV. Characteristic spatial charging patterns created by potential modulations of the commensurate G on BN are found[2].
[1] G. Giavaras and F. Nori, PRB 85, 165446 (2012)
[2] C. R. Woods et al., Nat. Phys. 10(6), 451-456 (2014)