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Photoemission spectroscopic evidence for the Dirac nodal line in monoclinic semimetal SrAs3
Physical Review Letters ( IF 9.227 ) Pub Date : 
Y. K. Song, G. W. Wang, S. C. Li, W. L. Liu, X. L. Lu, Z. T. Liu, Z. J. Li, J. S. Wen, Z. P. Yin, Z. H. Liu, and D. W. Shen

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 (EF), 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 SrAs3, which possesses a simple nodal loop in the vicinity of EF without the distraction from complicated trivial Fermi surfaces. Our calculations revealed that two bands with opposite parities were inverted around near EF, resulting in the single nodal loop at the Γ-- plane with a negligible spin-orbit coupling effect. The band crossings were tracked experimentally and the complete nodal loop was identified quantitatively, which provide a critical experimental support for the existence of nodal-line fermions in the CaP3 family of materials. Hosting simple topological non-trivial bulk electronic states around EF and without complication from the trivial states, SrAs3 is expected to be a potential platform for topological quantum state investigation and applications.
更新日期:2020-01-13

 

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