Quantum oscillations probe the Fermi surface topology of the nodal-line semimetal CaAgAs
- Resource Type
- Authors
- Siddharth Parameswaran; Amalia I. Coldea; David Graf; Yves H. Kwan; Matthew Bristow; D. Prabhakaran; Pascal Reiss; Y. Han; Alix McCollam
- Source
- Physical Review Research, 2, 1, pp. 1-5
Physical Review Research, 2, 1-5
Physical Review Research
- Subject
- Physics
Condensed Matter - Materials Science
Strongly Correlated Electrons (cond-mat.str-el)
Plane (geometry)
Point reflection
Quantum oscillations
Semiclassical physics
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
Fermi surface
Correlated Electron Systems
Topology
01 natural sciences
010305 fluids & plasmas
3. Good health
Magnetic field
Condensed Matter - Strongly Correlated Electrons
Geometric phase
0103 physical sciences
Orbit (dynamics)
010306 general physics
- Language
- English
- ISSN
- 2643-1564
Nodal semimetals are a unique platform to explore topological signatures of the unusual band structure that can manifest by accumulating a nontrivial phase in quantum oscillations. Here we report a study of the de Haasvan Alphen oscillations of the candidate topological nodal line semimetal CaAgAs using torque measurements in magnetic fields up to 45 T. Our results are compared with calculations for a toroidal Fermi surface originating from the nodal ring. We find evidence of a nontrivial Berry phase shift only in one of the oscillatory frequencies. We interpret this as a Berry phase arising from the semi-classical electronic Landau orbit which links with the nodal ring when the magnetic field lies in the mirror (ab) plane. Furthermore, additional Berry phase accumulates while rotating the magnetic field for the second orbit in the same orientation which does not link with the nodal ring. These effects are expected in CaAgAs due to the lack of inversion symmetry. Our study experimentally demonstrates that CaAgAs is an ideal platform for exploring the physics of nodal line semimetals and our approach can be extended to other materials in which trivial and nontrivial oscillations are present.
accepted Physical Review Research; 12 pages, 10 figures including supplemental materials