Assessing Nontrivial Topology in Weyl Semimetals by Dichroic Photoemission

Schusser, Jakub; Bentmann, Hendrik; Ünzelmann, Maxmillian; Figgemeier, Tim; Min, Chul -Hee; Moser, Simon; Neu, Jenn  N.; Siegrist, Theo; Reinert, F.

doi:10.1103/physrevlett.129.246404

Assessing Nontrivial Topology in Weyl Semimetals by Dichroic Photoemission

Journal Article · Thu Dec 08 23:00:00 EST 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.129.246404· OSTI ID:1909093

^[1]; Bentmann, Hendrik ^[1]; Ünzelmann, Maxmillian ^[1]; Figgemeier, Tim ^[1]; Min, Chul -Hee ^[2]; Moser, Simon ^[1]; Neu, Jenn N. ^[3]; Siegrist, Theo ^[4]; ^[1]

Univ. of Wurzburg (Germany)
Univ. zu Kiel (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Ruprecht Haensel Lab.
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); FAMU-FSU College of Engineering, Tallahassee, FL (United States)

The electronic structure of Weyl semimetals features Berry flux monopoles in the bulk and Fermi arcs at the surface. While angle-resolved photoelectron spectroscopy (ARPES) is successfully used to map the bulk and surface bands, it remains a challenge to explicitly resolve and pinpoint these topological features. Here we combine state-of-the-art photoemission theory and experiments over a wide range of excitation energies for the Weyl semimetals TaAs and TaP. Further, our results show that simple surface-band-counting schemes, proposed previously to identify nonzero Chern numbers, are ambiguous due to pronounced momentum-dependent spectral weight variations and the pronounced surface-bulk hybridization. Instead, our findings indicate that dichroic ARPES provides an improved approach to identify Fermi arcs but requires an accurate description of the photoelectron final state.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter; German Research Foundation (DFG)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1909093

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 129; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Assessing Nontrivial Topology in Weyl Semimetals by Dichroic Photoemission

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