Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 51: Poster: Electronic Structure of Surfaces: Spectroscopy, Surface States

O 51.13: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster B

Symmetry in photoelectron angular distribution of black phosphorus — •Katharina T. Ritter¹, Kenta Kuroda², Takeshi Kondo², Takao Sasagawa³, Koichiro Yaji², Shik Shin², and Markus Donath¹ — ¹Physikalisches Institut, University of Münster, Germany — ²ISSP, University of Tokyo, Japan — ³LMS, Tokyo Institute of Technology, Japan

Angle-resolved photoelectron spectroscopy (ARPES) is the technique to investigate the electronic structure of solids and molecules by measuring the photoemitted electron intensity versus their angular distribution or kinetic energy. Recently, the combination of ARPES with ab-initio electronic-structure calculations shows that the photoelectron angular distribution (PAD) can greatly give insights into electronic and structural properties of organic molecular layers [1]. However, the understanding of the PAD as a result of excitations from Bloch states in solids still remains challenging.

In this contribution, we apply this technique to electronic structure of black phosphorus (BP), which consists of puckered atomic layers coupled by weak inter-layer van der Waals forces. By using high-resolution ARPES combined with 7 eV laser light, we directly map the PAD. Remarkably, it is found that the PAD pattern sensitively depends on the linear polarization of the incident light. From this result, we discuss how the light polarization is related to the symmetry of the electronic state to give rise to the observed PAD pattern.

[1] J. Ziroff et al., Phys. Rev. Lett. 104 (2010) 233004