Observation of Unusual Topological Surface States in Half-Heusler Compounds LnPtBi (Ln=Lu, Y)

Abstract

Topological quantum materials represent a new class of matter with both exotic physical phenomena and novel application potentials. Many Heusler compounds, which exhibit rich emergent properties such as unusual magnetism, superconductivity and heavy fermion behaviour, have been predicted to host non-trivial topological electronic structures. The coexistence of topological order and other unusual properties makes Heusler materials ideal platform to search for new topological quantum phases (such as quantum anomalous Hall insulator and topological superconductor). By carrying out angle-resolved photoemission spectroscopy (ARPES) and ab initio calculations on rare-earth half-Heusler compounds LnPtBi (Ln=Lu, Y), we directly observed the unusual topological surface states on these materials, establishing them as first members with non-trivial topological electronic structure in this class of materials. Moreover, as LnPtBi compounds are non-centrosymmetric superconductors, our discovery further highlights them as promising candidates of topological superconductors.

15 pages, 4 figures

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• Half-Heusler topological insulators
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Cited by in corpus (63)

• Topological Materials: Weyl Semimetals
• Multiple Dirac cones at the surface of the topological metal LaBi
• Heusler, Weyl, and Berry
• Heusler 4.0: Tunable Materials
• Anomalous Hall effect in Weyl semimetal half Heusler compounds RPtBi (R = Gd and Nd)
• Topological quantum materials from the viewpoint of chemistry
• Beyond Triplet: Unconventional Superconductivity in a Spin-3/2 Topological Semimetal
• Bogoliubov Fermi surfaces: General theory, magnetic order, and topology
• First Principles Calculations for Topological Quantum Materials
• Superconductivity in three-dimensional spin-orbit coupled semimetals
• Prediction of triple point fermions in simple half-Heusler topological insulators
• Topological superconductivity of spin-3/2 carriers in a three-dimensional doped Luttinger semimetal
• Pairing states of spin-3/2 fermions: Symmetry-enforced topological gap functions
• Inflated nodes and surface states in superconducting half-Heusler compounds
• Efficient Charge-Spin Conversion and Magnetization Switching though Rashba Effect at Topological Insulator/Ag Interface
• Epitaxy, exfoliation, and strain-induced magnetism in rippled Heusler membranes
• Magnetotransport properties and giant anomalous Hall angle in half-Heusler compound TbPtBi
• Topological phase transitions in multi-component superconductors
• Pressure-induced Superconductivity in the Three-component Fermion Topological Semimetal Molybdenum Phosphide
• Model Hamiltonian and Time Reversal Breaking Topological Phases of Anti-ferromagnetic Half-Heusler Materials
• Majorana surface modes of nodal topological pairings in spin-$\frac{3}{2}$ semi-metals
• Anomalous Hall effect and negative longitudinal magnetoresistance in half-Heusler topological semimetal candidates TbPtBi and HoPtBi
• Topology of Triple-Point Metals
• Negative longitudinal magnetoresistance as a sign of a possible chiral magnetic anomaly in the half-Heusler antiferromagnet DyPdBi
• Linear-in-frequency optical conductivity in GdPtBi due to transitions near the triple points
• Tuning the Parity Mixing of Singlet-Septet Pairing in a Half-Heusler Superconductor
• Efficient spin current source using a half-Heusler alloy topological semimetal with Back-End-of-Line compatibility
• MgPd${}_2$Sb -- the first Mg-based Heusler-type superconductor
• Anomalous quantum oscillations and evidence for a non-trivial Berry phase in SmSb
• Accurate high-throughput screening of I-II-V 8-electron Half-Heusler compounds for renewable-energy applications
• Perspective: Heusler interfaces -- opportunities beyond spintronics?
• Evidence for unconventional superconductivity in Half-Heusler YPdBi and TbPdBi compounds revealed by London penetration depth measurements
• Band structure tuning of Heusler compounds revisited: Spin- and momentum-resolved electronic structure analysis of compounds with different band filling
• Quantum oscillations and a non-trivial Berry phase in the noncentrosymmetric superconductor BiPd
• Strain engineered higher order topological phases for spin-3/2 Luttinger fermions
• Interacting spin-3/2 fermions in a Luttinger semimetal: Competing phases and their selection in the global phase diagram
• Observation of Dirac state in half-Heusler material YPtBi
• Unconventional superconductivity and Surface pairing symmetry in Half-Heusler Compounds
• Giant spin Hall effect in half-Heusler alloy topological semimetal YPtBi grown at low temperature
• Tuning the topological character of half-Heusler systems: A comparative study on Y$T$Bi ($T$ = Pd, Pt)
• Exotic rare earth-based materials for emerging spintronic technology
• Edge currents as a probe of the strongly spin-polarized topological noncentrosymmetric superconductors
• New 111-type Semiconductor ReGaSi Follows 14e- Rules
• Antiferromagnetic spin fluctuations and unconventional superconductivity in topological superconductor candidate YPtBi revealed by ${}^{195}$Pt-NMR
• Ferromagnetic Cr4PtGa17: A Novel Half-Heusler-Type Compound with a Breathing Pyrochlore Lattice
• Intrinsic finite-energy Cooper pairing in $j=3/2$ superconductors
• Topological Nontrivial Phase in Hexagonal Antiperovskites A3BiB (A=Ba,Sr; B=P,N)
• Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn3
• Insulating Half-Heusler TmPdSb with Unusual Band Order and Metallic Surface States
• Structural, electronic and topological properties of 3D TmBi compound
• A Generative Approach to Joint Modeling of Quantitative and Qualitative Responses
• Unique Dirac and Triple point fermiology in simple transition metals and their binary alloys
• Polar hairs of mixed-parity nodal superconductors in Rarita-Schwinger-Weyl metals
• Strong-coupling superconductivity of the Heusler-type compound ScAu2Al: Ab-initio studies
• Non-trivial topological valence bands of common diamond and zinc-blende semiconductors
• Exchange gap in GdPtBi probed by magneto-optics
• Surface excitations relaxation in the Kondo insulator Sm${}_{1-x}$Gd${}_x$B${}_6$
• Reentrant topological phase in half-Heusler compounds
• Transverse and Longitudinal Magnetothermopower Promoted by Ambipolar Effect in Half-Heusler Topological Materials
• Berry Phase Enforced Spinor Pairing Order
• Chiral transport and electronic correlations in surface states of HfNiSn single crystals
• Twinning in ferromagnetic Heusler Rh2MnSb epitaxial thin films
• Correlated Hopf insulators