Photoemission Spectroscopic Evidence for the Dirac Nodal Line in Monoclinic Semimetal SrAs${}_3$

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.

References in corpus (47)

• Topological Insulators in Three Dimensions
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Maximally localized Wannier functions: Theory and applications
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• Classification of topological quantum matter with symmetries
• WannierTools: An open-source software package for novel topological materials
• Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
• Experimental discovery of Weyl semimetal TaAs
• Topological nodal semimetals
• Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
• Observation of the chiral anomaly induced negative magneto-resistance in 3D Weyl semi-metal TaAs
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Beyond Dirac and Weyl fermions: Unconventional quasiparticles in conventional crystals
• Experimental Realization of a Three-Dimensional Dirac Semimetal
• Anomalous Hall Effect and Magnetic Monopoles in Momentum-Space
• Discovery of a Weyl Fermion semimetal state in NbAs
• Topological nodal line semimetals with and without spin-orbital coupling
• Dirac Cone Protected by Non-Symmorphic Symmetry and 3D Dirac Line Node in ZrSiS
• Topological nodal line semimetals
• Nodal-chain metals
• Wien2wannier: From linearized augmented plane waves to maximally localized Wannier functions
• Topological quantum properties of chiral crystals
• Multiple types of topological fermions in transition metal silicides
• Large Fermi Arcs in Unconventional Weyl Semimetal RhSi
• Discovery of topological chiral crystals with helicoid arc states
• New classes of chiral topological nodes with non-contractible surface Fermi arcs in CoSi
• Experimental Observation of Three-Component 'New Fermions' in Topological Semimetal MoP
• Observation of Weyl nodes and Fermi arcs in TaP
• Observation of Chiral Fermions with a Large Topological Charge and and Associated Fermi-Arc Surface States in CoSi
• Triple Point Topological Metals
• Topological Semimetals with Triply Degenerate Nodal Points in θ-phase Tantalum Nitride
• Nodal-link semimetals
• Line-Node Dirac Semimetal and Topological Insulating Phase in Noncentrosymmetric Pnictides CaAgX (X = P, As)
• Topological Nodal Line Semimetals in CaP3 family of materials
• Unexpected Dirac-Node Arc in the Topological Line-Node Semimetal HfSiS
• Three-Dimensional Topological Insulators in I-III-VI${}_2$ and II-IV-V${}_2$ Chalcopyrite Semiconductors
• Tunability of the topological nodal-line semimetal phase in ZrSiX-type materials
• Coexistence of four-band nodal rings and triply-degenerate nodal points in centrosymmetric metal diborides
• New fermions on the line in topological symmorphic metals
• Topological Dirac Nodal-net Fermions in AlB${}_2$-type TiB${}_2$ and ZrB${}_2$
• Topological surface electronic states in candidate nodal-line semimetal CaAgAs
• Emergence of topological bands on the surface of ZrSnTe crystal
• Topological insulators from the Perspective of first-principles calculations
• Experimental Observation of Dirac Nodal Links in Centrosymmetric Semimetal TiB${}_2$
• Observation of a nodal chain with Dirac surface states in TiB2
• A single nodal loop of accidental degeneracies in minimal symmetry: triclinic CaAs${}_3$
• Evidence for a Dirac nodal-line semimetal in SrAs${}_3$

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• Spectroscopic Evidence on Realization of a Genuine Topological Nodal Line Semimetal in LaSbTe
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