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.
| Original language | English |
|---|---|
| Article number | 116402 |
| Journal | Physical Review Letters |
| Volume | 122 |
| Issue number | 11 |
| DOIs | |
| State | Published - Mar 22 2019 |
| Externally published | Yes |
Funding
H. B. thanks Jan Minár for helpful discussions. This work was supported by the DFG through SFB1170 “ToCoTronics” (projects A01, B04, C05, and C06), Grant No. RE 1469/13-1, through Grant No. SPP-1666, and by Grant No. ERC-StG-336012-Thomale-TOPOLECTRICS. We gratefully acknowledge the Gauss Centre for Supercomputing e.V. for funding this project by providing computing time on the GCS Supercomputer SuperMUC at Leibniz Supercomputing Centre. J. N. and T. S. acknowledge support from the National Research Foundation, under Grant No. NSF DMR-1606952. The crystal synthesis and characterization was carried out at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation, Division of Materials Research under Grants No. DMR-1157490 and No. DMR-1644779, the state of Florida, and Florida State University. S. M. acknowledges support by the Swiss National Science Foundation (Grant No. P300P2-171221). This research used resources of the Advanced Light Source, which is a U.S. Department of Energy Office of Science User Facility under Contract No. DE-AC02-05CH11231. This work was supported by the DFG through SFB1170 “ToCoTronics†(projects A01, B04, C05, and C06), Grant No. RE 1469/13-1, through Grant No. SPP-1666, and by Grant No. ERC-StG-336012-Thomale-TOPOLECTRICS. We gratefully acknowledge the Gauss Centre for Supercomputing e.V. for funding this project by providing computing time on the GCS Supercomputer SuperMUC at Leibniz Supercomputing Centre. J. N. and T. S. acknowledge support from the National Research Foundation, under Grant No. NSF DMR-1606952. The crystal synthesis and characterization was carried out at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation, Division of Materials Research under Grants No. DMR-1157490 and No. DMR-1644779, the state of Florida, and Florida State University. S. M. acknowledges support by the Swiss National Science Foundation (Grant No. P300P2-171221). This research used resources of the Advanced Light Source, which is a U.S. Department of Energy Office of Science User Facility under Contract No. DE-AC02-05CH11231.