Orbital Fingerprint of Topological Fermi Arcs in the Weyl Semimetal TaP

Chul-Hee Min, Hendrik Bentmann, Jennifer N. Neu, Philipp Eck, Simon Moser, Tim Figgemeier, Maximilian Ünzelmann, Katharina Kissner, Peter Lutz, Roland J. Koch, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Ronny Thomale, Giorgio Sangiovanni, Theo Siegrist, Domenico Di Sante, and Friedrich Reinert
Phys. Rev. Lett. 122, 116402 – Published 22 March 2019
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Abstract

The monopnictides TaAs and TaP are well-established Weyl semimetals. Yet, a precise assignment of Fermi arcs, accommodating the predicted chiral charge of the bulk Weyl points, has been difficult in these systems, and the topological character of different surface features in the Fermi surface is not fully understood. Here, employing a joint analysis from linear dichroism in angle-resolved photoemission and first-principles calculations, we unveil the orbital texture on the full Fermi surface of TaP(001). We observe pronounced switches in the orbital texture at the projected Weyl nodes, and show how they facilitate a topological classification of the surface band structure. Our findings establish a critical role of the orbital degrees of freedom in mediating the surface-bulk connectivity in Weyl semimetals.

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  • Received 26 July 2018
  • Revised 19 November 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.116402

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Chul-Hee Min1, Hendrik Bentmann1,*, Jennifer N. Neu2, Philipp Eck3, Simon Moser4, Tim Figgemeier1, Maximilian Ünzelmann1, Katharina Kissner1, Peter Lutz1, Roland J. Koch4, Chris Jozwiak4, Aaron Bostwick4, Eli Rotenberg4, Ronny Thomale3, Giorgio Sangiovanni3, Theo Siegrist5,2, Domenico Di Sante3, and Friedrich Reinert1

  • 1Experimentelle Physik VII, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
  • 2National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
  • 3Theoretische Physik I, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
  • 4Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 5Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, Florida 32310, USA

  • *Hendrik.Bentmann@physik.uni-wuerzburg.de

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Issue

Vol. 122, Iss. 11 — 22 March 2019

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