Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 9: Transport: Graphene and Carbon Nanostructures (jointly with HL/MA/TT)

DS 9.1: Vortrag

Montag, 20. März 2017, 15:00–15:15, HSZ 204

Creating and steering highly directional electron beams in grapheneMing-Hao Liu1,2, •Cosimo Gorini1, and Klaus Richter11Institut für Theoretische Physik, Universität Regensburg, Regensburg, Germany — 2Department of Physics, National Cheng Kung University, Tainan, Taiwan

We put forward a concept to create highly collimated, non-dispersive electron beams in pseudo-relativistic Dirac materials such as graphene or topological insulator surfaces [1]. Combining negative refraction and Klein collimation at a parabolic pn junction, the proposed lens generates beams, as narrow as a few Fermi wave lengths, that stay focused over scales of several microns and can be steered by a magnetic field without losing collimation. We demonstrate the lens capabilities by applying it to two paradigmatic settings of graphene electron optics: We propose a setup for observing high-resolution angle-dependent Klein tunneling, and, exploiting the intimate quantum-to-classical correspondence of these focused electron waves, we consider high-fidelity transverse magnetic focusing accompanied by simulations for current mapping through scanning gate microscopy. Our proposal opens up new perspectives for next-generation graphene electron optics experiments.

[1] M.-H. Liu, C. Gorini, K. Richter, arXiv:1608.01730.

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