Back to Search
Start Over
Photoemission Spectroscopic Evidence for the Dirac Nodal Line in Monoclinic Semimetal SrAs$_3$
- Publication Year :
- 2019
-
Abstract
- Topological nodal-line semimetals with exotic quantum properties are characterized by symmetry-protected line-contact bulk band crossings in the momentum space. However, in most of identified topological nodal-line compounds, these topological non-trivial nodal lines are enclosed by complicated topological trivial states at the Fermi energy ($E_F$), which would perplex their identification and hinder further applications. Utilizing angle-resolved photoemission spectroscopy and first-principles calculations, we provide compelling evidence for the existence of Dirac nodal-line fermions in the monoclinic semimetal SrAs$_3$, which are close to $E_F$ and away from distraction of complex trivial Fermi surfaces or surface states. Our calculation indicates that two bands with opposite parity are inverted around \emph{Y} near $E_F$, which results in the single nodal loop at the $\Gamma$-\emph{Y}-\emph{S} plane with a negligible spin-orbit coupling effect. We track these band crossings and then unambiguously identify the complete nodal loop quantitatively, which provides a critical experimental support to the prediction of nodal-line fermions in the CaP$_3$ family of materials. Hosting simple topological non-trivial bulk electronic states around $E_F$ and no interfering with surface states on the natural cleavage plane, SrAs$_3$ is expected to be a potential platform for topological quantum state investigation and applications.
- Subjects :
- Physics
Condensed Matter - Materials Science
Quantum Physics
Condensed matter physics
Condensed Matter - Mesoscale and Nanoscale Physics
Photoemission spectroscopy
Dirac (software)
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
General Physics and Astronomy
Position and momentum space
Fermi energy
Fermion
01 natural sciences
Semimetal
Loop (topology)
Quantum state
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
Condensed Matter::Strongly Correlated Electrons
Quantum Physics (quant-ph)
010306 general physics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....1bf10ddc2fb9bbd6bf221b9afd0a58c9