%0 Journal Article %1 PhysRevLett.129.246404 %A Schusser, J. %A Bentmann, H. %A Ünzelmann, M. %A Figgemeier, T. %A Min, C.-H. %A Moser, S. %A Neu, J. N. %A Siegrist, T. %A Reinert, F. %D 2022 %I American Physical Society %J Phys. Rev. Lett. %K a %N 24 %P 246404 %R 10.1103/PhysRevLett.129.246404 %T Assessing nontrivial topology in Weyl semimetals by dichroic photoemission %U https://link.aps.org/doi/10.1103/PhysRevLett.129.246404 %V 129 %X 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. 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.

@article{PhysRevLett.129.246404, abstract = {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. 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.}, added-at = {2023-04-06T15:28:19.000+0200}, author = {Schusser, J. and Bentmann, H. and Ünzelmann, M. and Figgemeier, T. and Min, C.-H. and Moser, S. and Neu, J. N. and Siegrist, T. and Reinert, F.}, biburl = {https://www.bibsonomy.org/bibtex/2fa74e8e43daf8fd9a68b177b2ba6c8d5/ctqmat}, day = 09, description = {Assessing nontrivial topology in Weyl semimetals by dichroic photoemission}, doi = {10.1103/PhysRevLett.129.246404}, interhash = {2be53d8e88fe24d0b7abb6c8498e7862}, intrahash = {fa74e8e43daf8fd9a68b177b2ba6c8d5}, journal = {Phys. Rev. Lett.}, keywords = {a}, month = {12}, number = 24, numpages = {7}, pages = 246404, publisher = {American Physical Society}, timestamp = {2023-04-06T15:28:19.000+0200}, title = {Assessing nontrivial topology in Weyl semimetals by dichroic photoemission}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.129.246404}, volume = 129, year = 2022 }