Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 80: Graphene
TT 80.10: Vortrag
Donnerstag, 15. März 2018, 12:00–12:15, H 3005
Mechanisms of magnetoconductance oscillations in graphene pn junctions — •Ming-Hao Liu1 and Klaus Richter2 — 1Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan — 2Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany
Two-terminal conductance of a graphene pn junction may oscillate with various dependencies, such as carrier density, magnetic field, or even the position of the pn junction. In this talk, various mechanisms giving rise to the oscillation are discussed, focusing on the recent two experiments supported by our quantum transport simulations, one at intermediate magnetic fields [1] and the other at high magnetic fields [2]. The former corresponds to a regime with high filling factors and shows an unusual even-odd effect of the Landau levels, with the underlying mechanism not completely clear. The latter corresponds to a regime with low/lowest filling factors, showing first experimental evidence of valley-isospin-dependent conductance oscillation [3].
H. Overweg et al., Nano Lett. 17, 2852 (2017)
[2] C. Handschin et al., Nano Lett. 17, 5389 (2017)
[3] J. Tworzydło et al., Phys. Rev. B 76, 035411 (2007)