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TT: Fachverband Tiefe Temperaturen

TT 58: Focus Session on 2D Materials: Ballistic Quantum Transport in Graphene (jointly with DY, DS, HL, MA, O)

TT 58.3: Hauptvortrag

Donnerstag, 23. März 2017, 10:30–11:00, HSZ 03

Electron Optics in Ballistic Graphene — •Ming-Hao Liu — Department of Physics, National Cheng Kung University

Electrons in clean graphene are known to behave like “charged photons” due to its celebrated energy dispersion linear in momentum, providing an ideal platform for exploring electron optics. Despite the discovery of graphene in 2004, devices of ultraclean samples with micron-scale mean free paths became accessible only recently. Reliable quantum transport simulations in the ballistic limit for understanding and predicting high-quality transport experiments have therefore become increasingly demanded nowadays. In this talk, an overview of our recent progress on simulating a variety of ballistic graphene transport experiments will be given, such as Fabry-Pérot interference, snake states, and gate-defined electron waveguides [1]. Keys to such quantum transport simulations will be briefly introduced [2]. Ongoing works possibly including pnp junctions in the presence of 2D Moiré superlattice and Weiss oscillation due to 1D periodic gating will be mentioned at the end of the talk.

[1] P. Rickhaus et al., Nat. Communs. 4, 2342 (2013); M. Drienovsky et al., Phys. Rev. B 89, 115421 (2014); A. Varlet et al., Phys. Rev. Lett. 113, 116601 (2014); P. Rickhaus et al., Nat. Communs. 6, 6470 (2015); P. Rickhaus et al., Nano Lett. 15, 5819 (2015).

[2] M.-H. Liu et al., Phys. Rev. Lett. 114, 036601 (2015).