SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 16: Mini-Symposium: Free-standing functional molecular 2D materials II

O 16.4: Hauptvortrag

Montag, 1. März 2021, 14:30–15:00, R2

Electronic properties of freestanding ultra-thin small-molecular and multilayer graphene films — •Thomas Weitz — I. Physics Institute, Faculty of Physics, Georg-August-University Göttingen, Germany — AG Physics of Nanosystems, Faculty of Physics, LMU Munich, Germany

Suspension of thin functional films allows to investigate their electronic properties in vacuum - a low-dielectric (low-k) environment free from contaminants. Two examples of our recent work in this direction will be discussed: 1.) Highly-crystalline, two molecule thin organic semiconducting films composed of an electron-conductive perylene-diimide have been investigated by temperature-dependent charge transport and have shown a small density of charge traps due to the inert surrounding. [1] 2.) Enabled by the low-k surrounding, dually-gated, suspended bi- and trilayer graphene films show exchange-driven quantum phases such as the quantum anomalous Hall effect. [2-4]

[1] L.S. Schaffroth, J. Lenz, V. Geigold, M. Kögl, A. Hartschuh, R.T. Weitz, Adv. Mat. 31, 1808309 (2019) [2] R.T. Weitz, M.T. Allen, B.E. Feldman, J. Martin, and A. Yacoby, Science 330, 812 (2010) [3] F.R. Geisenhof, R.T. Weitz et al. In preparation (2021) [4] F. Winterer, R.T. Weitz et al. In preparation (2021)