Low Carrier Density Metal Realized in Candidate Line-Node Dirac Semimetals CaAgP and CaAgAs

Abstract

We study polycrystalline samples of the hexagonal pnictides, CaAgP and CaAgAs, both of which are ideal candidates for line-node Dirac semimetals. The polycrystalline samples of CaAgP and CaAgAs obtained in this study are low-carrier metals, where hole carriers are dominant. By combining the hole carrier densities estimated from Hall coefficients and the electronic structures calculated by first principles calculations, both samples are found to have a ring-torus Fermi surface, derived from a ring-shaped Dirac line node. In the phosphide sample, the Fermi energy EF is located at around the end of the linear dispersion region of the electronic bands, while the EF in the arsenide sample exists in the middle of this region, suggesting that the arsenide is a more promising system for uncovering the physics of line-node Dirac semimetals.

arXiv comment6 pages, 5 figures

References in corpus (32)

• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
• Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
• Dirac semimetal in three dimensions
• Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd${}_3$As${}_2$
• Experimental Realization of a Three-Dimensional Dirac Semimetal
• Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
• Observation of Weyl nodes in TaAs
• Dirac Line Nodes in Inversion Symmetric Crystals
• Topological Nodal Line Semimetal and Dirac Semimetal State in Antiperovskite Cu${}_3$PdN
• Dirac Cone Protected by Non-Symmorphic Symmetry and 3D Dirac Line Node in ZrSiS
• Topological Node-Line Semimetal in Three Dimensional Graphene Networks
• Multi-Weyl Topological Semimetals Stabilized by Point Group Symmetry
• Landau Quantization and Quasiparticle Interference in the Three-Dimensional Dirac Semimetal Cd3As2
• Observation of Topological Nodal Fermion Semimetal Phase in ZrSiS
• Weyl semimetal with broken time reversal and inversion symmetries
• Topological semi-metals with line nodes and drumhead surface states
• Classification of reflection symmetry protected topological semimetals and nodal superconductors
• Potential ring of Dirac nodes in a new polymorph of Ca${}_3$P${}_2$
• Line of Dirac Nodes in Hyper-Honeycomb Lattices
• Discovery of Dirac Node Arcs in PtSn4
• Semimetal and Topological Insulator in Perovskite Iridates
• Line-Node Dirac Semimetal and Topological Insulating Phase in Noncentrosymmetric Pnictides CaAgX (X = P, As)
• Anomalous orbital magnetism in Dirac-electron systems: Role of pseudo-spin paramagnetism
• Unexpected Dirac-Node Arc in the Topological Line-Node Semimetal HfSiS
• Surface and bulk Fermiology and band dispersion in non-centrosymmetric BiTeI
• Nexus and Dirac lines in topological materials
• Magnetic field-induced insulator-semimetal transition in a pyrochlore Nd2Ir2O7
• Band-Contact Lines in Electron Energy Spectrum of Graphite
• Bulk crystal growth and electronic characterization of the 3D Dirac Semimetal Na3Bi
• Superconductivity in the Hexagonal Ternary Phosphide ScIrP

Cited by in corpus (27)

• Topological Semimetals from first-principles
• Observation of Dirac-like energy band and ring-torus Fermi surface associated with the nodal line in topological insulator CaAgAs
• Topological crystalline superconductivity and second-order topological superconductivity in nodal-loop materials
• Topological transport in Dirac nodal-line semimetals
• Flat optical conductivity in ZrSiS due to two-dimensional Dirac bands
• Hybrid Dirac Semimetal in CaAgBi Materials Family
• Magneto-transport properties of the "hydrogen atom" nodal-line semimetal candidates CaTX (T=Ag, Cd, X=As, Ge)
• Topological surface superconductivity in doped Weyl loop materials
• Crossing-Line-Node Semimetals: General Theory and Application to Rare-Earth Trihydrides
• Quantum Oscillations in Nodal Line Systems
• Trivial topological phase of CaAgP and the topological nodal-line transition in CaAg(P1-xAsx)
• Interplay between short-range correlated disorder and Coulomb interaction in nodal-line semimetals
• Universal phase transition and band structures for spinless nodal-line and Weyl semimetals
• Quantum oscillations probe the Fermi surface topology of the nodal-line semimetal CaAgAs
• Disorder driven multifractality transition in Weyl nodal loops
• Nodal-line semimetals from Weyl superlattices
• Nodal topological superconductivity in nodal-line semimetals
• High-Mobility Carriers Induced by Chemical Doping in the Candidate Nodal-Line Semimetal CaAgP
• Effect of mechanical strain on the optical properties of nodal-line semimetal ZrSiS
• Real spin and pseudospin topologies in the noncentrosymmetric topological nodal-line semimetal CaAgAs
• Drumhead surface states and their signatures in quasiparticle scattering interference
• Quantized Hall conductance in 3D topological nodal-line semimetals without chiral symmetry
• Role of Velocity Field and Principal Axis of Tilted Dirac Cones in Effective Hamlitonan of Non-Coplanar Nodal Loop
• Unusual Resistive Transitions in the Nodal-Line Semimetallic Superconductor NaAlSi
• Delocalization of topological surface states by diagonal disorder in nodal loop semimetals
• Pseudogap Formation in the Nodal-Line Semimetal NaAlGe
• Disorder induced dynamical interband response in Dirac nodal line semimetals