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Optical Transitions of a Single Nodal Ring in SrAs3: Radially and Axially Resolved Characterization

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Title
Optical Transitions of a Single Nodal Ring in SrAs3: Radially and Axially Resolved Characterization
Author(s)
Jeon, Jiwon; Jang, Jiho; Hoil Kim; Park, Taesu; Kim, Dongwook; Moon, Soonjae; Jun Sung Kim; Shim, Ji Hoon; Min, Hongki; Choi, Eunjip
Publication Date
2023-12
Journal
Physical Review Letters, v.131, no.23
Publisher
American Physical Society
Abstract
SrAs3 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 SrAs3 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. The axis-resolved optical conductivity, in combination with theoretical calculations, further reveals 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. © 2023 American Physical Society.
URI
https://pr.ibs.re.kr/handle/8788114/14661
DOI
10.1103/PhysRevLett.131.236903
ISSN
0031-9007
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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