Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 43: Poster Tuesday: Electronic Structure

O 43.11: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Electronic properties of potassium-doped black phosphorus on the atomic scale — Brian Kiraly, •Elze Jantien Knol, Daniel Wegner, and Alexander Ako Khajetoorians — Scanning Probe Microscopy, Radboud University, Nijmegen, the Netherlands

In 2015 it was proposed that by applying a surface electric field gradient to few-layer black phosphorus, the material can be tuned from a moderate-gap semiconductor into a band-inverted semimetal [1]. Experimentally, it was shown that such a transition can be achieved by adding potassium atoms to the surface [2]. Since then there has been interest in the electronic properties of the surface of black phosphorus and the role of potassium. Here, utilizing low-temperature scanning tunneling microscopy and spectroscopy, we probe the variations in the electronic properties of black phosphorus, with varying surface coverage of potassium at the atomic scale. We discuss the changes to both the band-gap and Fermi energy, in the presence of surface doping. Moreover, we present the effect of charge-mediated interactions on the atomic distribution of potassium atoms, and relate this to the electrostatic screening of black phosphorus.

[1] Q. Liu, X. Zhang, L. B. Abdalla, A. Fazzio, A. Zunger. Nano Lett. 15 (2), 2015.

[2] J. Kim, S. S. Baik, S. H. Ryu, Y. Sohn, S. Park, B. G. Park, J. Denlinger, Y. Yi, H. J. Choi, K. S. Kim. Science 349 (6249), 2015.