Orbital Fingerprint of Topological Fermi Arcs in a Weyl Semimetal

The monopnictides TaAs and TaP are well-established Weyl semimetals. Yet, a precise assignment of Fermi arcs, accomodating 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...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2020-03
Main Authors: Chul-Hee Min, Bentmann, Hendrik, Neu, Jennifer N, Eck, Philipp, Moser, Simon K, Figgemeier, Tim, Ünzelmann, Maximilian, Treiber, Katharina, Lutz, Peter, Koch, Roland, Jozwiak, Chris, Bostwick, Aaron, Rotenberg, Eli, Thomale, Ronny, Sangiovanni, Giorgio, Siegrist, Theo, Domenico Di Sante, Reinert, Friedrich
Format: Article
Language:English
Subjects:
Chirality
Fermi surfaces
Fingerprints
First principles
Metalloids
Photoelectric emission
Quantum theory
Surface layers
Topology
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The monopnictides TaAs and TaP are well-established Weyl semimetals. Yet, a precise assignment of Fermi arcs, accomodating 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 projectedWeyl 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1803.03977