Joint Meeting of PSRS Members and SOLARIS Centre Users

UNVEILING IMPERVIOUS BAND CROSSINGS IN THE BULK OF TOPOLOGICAL NODAL-LINE SEMIMETAL ZrAs$_2$

Not scheduled

1h 50m

SOLARIS Centre

Session VIII - Spectroscopy with synchrotron light (II)

Description

Topological nodal line semimetals (TNLSMs) are a fascinating class of materials, distinguished by their unique electronic structures and symmetry-driven properties. ZrAs$_2$ is a notable example, featuring nodal lines in momentum space dictated by non-symmorphic symmetries. In this work, we combine angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT) calculations to investigate the electronic characteristics of ZrAs$_2$.
Using ARPES, we have mapped the Fermi surface and observed impervious band crossings resistant to gap opening, providing experimental validation of non-symmorphic symmetry-protected nodal lines in ZrAs$_2$. The ARPES measurements reveal distinctive surface and bulk states at varying photon energies, linked to these nodal lines. Supported by DFT calculations, we uncover robust band crossings at specific points within the Brillouin zone, particularly around the S point (see Figure 1). Detailed slab calculations further illuminate the surface bands and bulk states near these crossings, reinforcing our experimental observations. These findings significantly advance our comprehension of ZrAs$_2$'s electronic structure and contribute to the broader understanding of TNLSMs [A. Wadge et al. Phys. Rev. B $\textbf110$, 035142 (2024)].