| Title: |
Optical transitions of a single nodal ring in SrAs$_3$: radially and axially resolved characterization |
| Authors: |
Jeon, Jiwon, Jang, Jiho, Kim, Hoil, Park, Taesu, Kim, DongWook, Moon, Soonjae, Kim, Jun Sung, Shim, Ji Hoon, Min, Hongki, Choi, Eunjip |
| Source: |
PhysRevLett.131.236903(2023) |
| Publication Year: |
2023 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Strongly Correlated Electrons |
| More Details: |
SrAs$_3$ is a unique nodal-line semimetal that contains only a single nodal ring in the Brillouin zone, uninterrupted by any trivial bands near the Fermi energy. We performed axis-resolved optical reflection measurements on SrAs$_3$ and observed that the optical conductivity exhibits flat absorption up to 129 meV in both the radial and axial directions, confirming the robustness of the universal power-law behavior of the nodal ring. Furthermore, in conjunction with model and first-principles calculations, the axis-resolved optical conductivity unveiled fundamental properties beyond the flat absorption, including the overlap energy of the topological bands, the spin-orbit coupling gap along the nodal ring, and the geometric properties of the nodal ring such as the average ring radius, ring ellipticity, and velocity anisotropy. In addition, our temperature-dependent measurements revealed a spectral weight transfer between intraband and interband transitions, indicating a possible violation of the optical sum rule within the measured energy range.
Comment: 6 pages, 4 figures + supplemental material (22 pages, 10 figures) |
| Document Type: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.131.236903 |
| Access URL: |
http://arxiv.org/abs/2303.14973 |
| Accession Number: |
edsarx.2303.14973 |
| Database: |
arXiv |
