Topological crystalline insulator states in Pb(1-x)Sn(x)Se

Abstract

Topological insulators are a novel class of quantum materials in which time-reversal symmetry, relativistic (spin-orbit) effects and an inverted band structure result in electronic metallic states on the surfaces of bulk crystals. These helical states exhibit a Dirac-like energy dispersion across the bulk bandgap, and they are topologically protected. Recent theoretical proposals have suggested the existence of topological crystalline insulators, a novel class of topological insulators in which crystalline symmetry replaces the role of time-reversal symmetry in topological protection [1,2]. In this study, we show that the narrow-gap semiconductor Pb(1-x)Sn(x)Se is a topological crystalline insulator for x=0.23. Temperature-dependent magnetotransport measurements and angle-resolved photoelectron spectroscopy demonstrate that the material undergoes a temperature-driven topological phase transition from a trivial insulator to a topological crystalline insulator. These experimental findings add a new class to the family of topological insulators. We expect these results to be the beginning of both a considerable body of additional research on topological crystalline insulators as well as detailed studies of topological phase transitions.

v2: published revised manuscript (6 pages, 3 figures) and supplementary information (5 pages, 8 figures)

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• Fermi surfaces of composite fermions
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• Realizing tunable Fermi level in SnTe by defect control
• Engineering Dirac electrons emergent on the surface of a topological insulator
• Correlated electrons in a Crystalline Topological insulator
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• Topological Fermi-arc-like surface states in Kramers nodal line metals
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• First principles study of bandgap tuning in GePbSe
• Physical Pictures for Quasisymmetry in Crystals
• Optical manipulation of the topological phase in ZrTe5 revealed by time- and angle-resolved photoemission
• Spectral analysis of the magneto-optical response in valley polarized Pb${}_{1-x}$Sn${}_x$Se
• Bright mid-infrared photoluminescence from high dislocation density epitaxial PbSe films on GaAs
• Proximity-Induced Superconductivity in a Topological Crystalline Insulator
• Quantum matter in ultrahigh magnetic fields
• Signature of topological crystalline insulating behavior in new B2X2Zn (X=Ir, Rh, Co) compound from first-principles Computation
• Tailoring topological states of core-shell nanoparticles
• From narrow-gap and semimagnetic semiconductors to spintronics and topological matter: a life with spins
• Super-resonant transport of topological surface states subjected to in-plane magnetic fields
• Controlled electron transmission by lead chalcogenide barrier potential
• Pressure-induced superconductivity and topological phase transitions in the topological nodal-line semimetal SrAs3
• Chiral $p-$wave superconductivity in Pb${}_{1-x}$Sn${}_x$Te: signatures from bound-state spectra and wavefunctions
• Magnetic-Field Tunable Möbius and Higher-Order Topological Insulators in Three-Dimensional Layered Octagonal Quasicrystals