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

被引：1

作者：

Jeon, Jiwon ^{[1
,2
]}

Jang, Jiho ^{[3
]}

Kim, Hoil ^{[4
,5
]}

Park, Taesu ^{[6
]}

Kim, Dongwook ^{[7
]}

Moon, Soonjae ^{[7
]}

Kim, Jun Sung ^{[5
]}

Shim, Ji Hoon ^{[6
]}

Min, Hongki ^{[3
]}

Choi, Eunjip ^{[2
]}

机构：

[1] Univ Seoul, Nat Sci Res Inst, Seoul 02504, South Korea

[2] Univ Seoul, Phys Dept, Seoul 02504, South Korea

[3] Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea

[4] Inst Basic Sci IBS, Ctr Artificial Low Dimens Elect Syst, Pohang 37673, South Korea

[5] Pohang Univ Sci & Technol POSTECH, Dept Phys, Pohang 37673, South Korea

[6] Pohang Univ Sci & Technol POSTECH, Dept Chem, Pohang 37673, South Korea

[7] Hanyang Univ, Dept Phys, Seoul 04763, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2023年 / 131卷 / 23期

关键词：

Arsenic compounds - Strontium compounds;

D O I：

10.1103/PhysRevLett.131.236903

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：6