Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 43: Poster Tuesday: Electronic Structure

O 43.10: Poster

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

Tunable Surface Band Inversion in Black Phosphorous — •Klara Volckaert¹, Deepnarayan Biswas¹, Brian Kiraly², Søren Ulstrup¹, Charlotte Sanders³, Marco Bianchi¹, Alexander Khajetoorians², and Philip Hofmann¹ — ¹Aarhus University, Aarhus, Denmark — ²Radboud University, Nijmegen, The Netherlands — ³Central Laser Facility, Harwell, United Kingdom

Black phosphorous is a semiconductor that is gaining interest due to its tunable bandgap, which is thought to lead to an anisotropic Dirac semimetal upon critical doping with alkalis. Therefore this material could prove relevant to electronic and optoelectronic devices. Here we study the effect of potassium doping on bulk black phosphorous that leads to an elliptical electron-like pocket appearing. The nature of these bands is deduced using the k_z dispersion acquired by means of angle-resolved photoemission spectroscopy (ARPES). Curiously, at high levels of potassium deposition, electron-like states emerge below the Fermi level that have not previously been reported.