SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: Poster: Topology and Symmetry-Protected Materials
O 65.5: Poster
Mittwoch, 29. März 2023, 18:00–20:00, P2/EG
Orbital Protection of a Weyl Nodal line — •Tim Figgemeier1,3, Maximilian Ünzelmann1,3, Philipp Eck2,3, Jakub Schusser1,3, Jennifer Neu4,5, Theo Siegrist4,6, Domenico Di Sante7, Giorgio Sangiovanni2,3, Hendrik Bentmann1,3,8, and Friedrich Reinert1,3 — 1EP VII, Universität Würzburg, Germany — 2ITPA, Universität Würzburg, Germany — 3Würzburg-Dresden Cluster of Excellence, ct.qmat — 4NHMFL, Tallahassee, FL, US — 5Nuclear Nonproliferation Division, ORNL, Oak Ridge, Tennessee, US — 6FAMU-FSU, Tallahassee, FL, US — 7Center for Computational Quantum Physics, Flatiron Institute, New York, US — 8NTNU, Trondheim, Norway
We present a combined soft X-ray angle-resolved photoelectron spectroscopy (SX-ARPES) and density functional theory study on TaAs and NbP. The two compounds are usually known as paradigmatic non-magnetic Weyl semimetals. Here, however, we show that they further host twofold spin-degenerate nodal lines located at the center of a one-dimensional vortex line of Orbital Angular Momentum (OAM). These momentum space vortices can be tracked experimentally by using kz-resolved dichroic SX-ARPES. The OAM vortex line protects the spin degeneracy against spin-orbit coupling and imparts high topological robustness to the nodal line. In order to investigate the impact of SOC on the degeneracy experimentally, we compare TaAs with NbP, which differ from each other by having a different magnitude of atomic SOC strength.