Experimental realization of a topological crystalline insulator in SnTe

Abstract

Topological insulators materialize a topological quantum state of matter where unusual gapless metallic state protected by time-reversal symmetry appears at the edge or surface. Their discovery stimulated the search for new topological states protected by other symmetries, and a recent theory predicted the existence of "topological crystalline insulators" (TCIs) in which the metallic surface states are protected by mirror symmetry of the crystal. However, its experimental verification has not yet been reported. Here we show the first and definitive experimental evidence for the TCI phase in tin telluride (SnTe) which was recently predicted to be a TCI. Our angle-resolved photoemission spectroscopy shows clear signature of a metallic Dirac-cone surface band with its Dirac point slightly away from the edge of the surface Brillouin zone in SnTe. On the other hand, such a gapless surface state is absent in a cousin material lead telluride (PbTe), in line with the theoretical prediction. Our result establishes the presence of a TCI phase, and opens new avenues for exotic topological phenomena.

11 pages, 3 figures

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• Classification of topological insulators and superconductors in three spatial dimensions
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• Local Probes for Quantum Hall Ferroelectrics and Nematics
• Strain-induced two-dimensional topological crystalline insulator
• Surface Oxidation of SnTe Analyzed by Self-Consistent Fitting of all Emission Peaks in its X-ray Photoelectron Spectrum
• Theory of interaction-induced renormalization of Drude weight and plasmon frequency in chiral multilayer graphene
• Mirror Chern numbers in the hybrid Wannier representation
• Topological Signatures in Nodal Semimetals through Neutron Scattering
• Weak localization and Berry flux in topological crystalline insulators with a quadratic surface spectrum
• Non-Hermitian ${\mathbb{Z}}_4$ skin effect protected by glide symmetry
• Evidence of phase stability, topological phonon and temperature-induced topological phase transition in rocksalt SnS and SnSe
• Sub-symmetry Protected Topology in Topological Insulators and Superconductors
• Localized Singlets and Ferromagnetic Fluctuations in the Dilute Magnetic Topological Insulator Sn${}_{0.95}$Mn${}_{0.05}$Te
• Second-order topological insulator in Bilayer borophene
• Tuning topological surface states by cleavage angle in topological crystalline insulators
• Superconductivity in tin telluride films grown by molecular beam epitaxy
• Electronic structure in a transition metal dipnictide TaAs2
• Reconstruction, rumpling, and Dirac states at the (001) surface of a topological crystalline insulator Pb1-xSnxSe
• Saddle point singularity and topological phase diagram in a tunable topological crystalline insulator (TCI)
• Hedgehog spin texture and competing orders associated with strains on the surface of a topological crystalline insulator
• Role of Hund's splitting in electronic phase competition in ${\mathrm{Pb}}_{1-x}{\mathrm{Sn}}_x\mathrm{Te}$
• Effective field theories for interacting boundaries of 3D topological crystalline insulators through bosonisation
• Tilted Dirac Fermions
• Competing effects of Hund's splitting and symmetry-breaking perturbations on electronic order in Pb${}_{1-x}$Sn${}_x$Te
• Anomalous Behaviour in the Magneto-Optics of a Gapped Topological Insulator
• Fermiology and transport properties of the proposed topological crystalline insulator SrAg4Sb2
• RKKY interaction in helical higher-order topological insulators
• Non-equilibrium States and Interactions in the Topological Insulator and Topological Crystalline Insulator Phases of NaCd4As3
• Realizing tunable Fermi level in SnTe by defect control
• Superconductivity, valence-skipping and topological crystalline metal in AgSnSe${}_2$
• Stability of the X-Y-phase of the two-dimensional C4 point group insulator
• Cr resonant impurity for studies of band inversion and band offsets in IV-VI semiconductors
• Tuning topological surface magnetism by bulk alloying
• Exploring temperature dependent electron-electron interaction of topological crystalline insulators (SnS and SnSe) within Matsubara-time domain
• Correlated electrons in a Crystalline Topological insulator
• Engineering Dirac electrons emergent on the surface of a topological insulator
• Interaction-driven phase transition in one dimensional mirror-symmetry protected topological insulator
• Inducing Quantum Phase Transitions in Non-Topological Insulators Via Atomic Control of Sub-Structural Elements
• Mass fluctuations and absorption rates in Dirac materials sensors
• Engineering Majorana Kramers Pairs In Synthetic High Spin Chern Insulators
• Tensor network representations of fermionic crystalline topological phases on two-dimensional lattices
• Crystalline finite-size topology
• General method for calculating transport properties of disordered mesoscopic systems based on the nonequilibrium Green's function formalism
• Fermions in $(1+2)$-dimensions modified by nonminimal coupling and its applications to condensed matter physics
• Theory of Topological Superconductivity in Doped IV-VI Semiconductors
• Tunable Competing Electronic Orders in Double Quantum Spin Hall Superlattices
• Topological Fermi-arc-like surface states in Kramers nodal line metals
• Versatile strain relief pathways in epitaxial films of (001)-oriented PbSe on III-V substrates
• Emergence of Type-I and Type-II Dirac line nodes in penta-octa-graphene
• Pressure-induced superconductivity and topological phase transitions in the topological nodal-line semimetal SrAs3
• Direct observation of the electronic structure of even-layer puckered SnTe monolayer films on graphene
• Non-Trivial Topological Phase in the Sn_{1-x}In_xTe Superconductor
• Crystalline topological states at a topological insulator junction
• Magnetic-Field Tunable Möbius and Higher-Order Topological Insulators in Three-Dimensional Layered Octagonal Quasicrystals
• Physical Pictures for Quasisymmetry in Crystals
• Signature of topological crystalline insulating behavior in new B2X2Zn (X=Ir, Rh, Co) compound from first-principles Computation
• Superconductivity in In-doped AgPbBiTe3 compounds synthesized by high-pressure synthesis
• SnAs: a 4K weak type-II superconductor with non-trivial band topology
• Magnetically tuned topological phase in graphene nanoribbon heterojunctions
• Theory of Superconductivity Mediated by Topological Phonons
• Quantum matter in ultrahigh magnetic fields
• Super-resonant transport of topological surface states subjected to in-plane magnetic fields
• Anomalies in the temperature evolution of the Dirac states in a topological crystalline insulator SnTe
• Chiral $p-$wave superconductivity in Pb${}_{1-x}$Sn${}_x$Te: signatures from bound-state spectra and wavefunctions
• Proximity-Induced Superconductivity in a Topological Crystalline Insulator