Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 4: Topology and Symmetry-Protected Materials
O 4.1: Vortrag
Montag, 5. September 2022, 10:30–10:45, H6
Tracing a Weyl Nodal Line in 3D-k-space via ARPES — •Tim Figgemeier1, Maximilian Ünzelmann1, Philipp Eck2, Jakub Schusser1, Jennifer Neu3,4, Theo Siegrist3,5, Domenico Di Sante6, Giorgio Sangiovanni2, Hendrik Bentmann1 und Friedrich Reinert1 — 1EP VII, Universität Würzburg, Germany — 2TP I, Universität Würzburg, Germany — 3NHMFL, Tallahassee, FL, US — 4Nuclear Nonproliferation Division, ORNL, Oak Ridge, Tennessee 37831, US — 5FAMU-FSU, Tallahassee, FL, US — 6Center for Computational Quantum Physics, Flatiron Institute, New York 10010, US
In contrast to the more conventional Dirac nodal lines, Weyl nodal lines (WNL) are only twofold-degenerate and this degeneracy is robust against strong spin-orbit coupling [1]. The occurance of WNL is guaranteed by the combination of a glide plane and time-reversal symmetry (TRS).
In this talk we will present a soft x-ray angle-resolved photoemission (ARPES) study where we will trace a WNL in 3D k-space throughout the Brillouinzone over a wide range of photon energies. The experimental results are compared to density functional and photoemission calculations. By utilizing dichroic ARPES experiments, we will moreover address the characteristics of the electronic wave functions around the WNL.
[1] M. Hirschmann et al.; Symmetry-enforced band crossings in tetragonal materials: Dirac and Weyl degeneracies on points, lines, and planes; Phys. Rev. Mat 5; 054202 (2021)