Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 73: Electronic Structure of Surfaces 1

O 73.3: Vortrag

Donnerstag, 8. September 2022, 15:30–15:45, S053

Distinct Tamm and Shockley surface states on Re(0001) - mixed by spin-orbit interaction — •Marcel Holtmann¹, Peter Krüger¹, Koji Miyamoto², Taichi Okuda², Pascal J. Grenz¹, Shiv Kumar², and Markus Donath¹ — ¹Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany — ²Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan

Tamm and Shockley states - two paradigmatic concepts are used to describe surface states not only in electronic systems but also in photonic and phononic crystals. The Re(0001) surface hosts both types of electronic surface states in neighboring but qualitatively different energy gaps. Interestingly, spin-orbit interaction generates a double "W"-shaped energy vs. k_∥ dispersion by mixing both types of states and lifting their spin degeneracy. By combining spin- and angle-resolved photoemission, tight-binding model calculations as well as density functional theory including the photoemission process, we develop verifiable criteria to distinguish between the two types of surface states and arrive at a consistent picture of the role of spin-orbit interaction in such a scenario.