Topological phase diagram and saddle point singularity in a tunable topological crystalline insulator

Abstract

We report the evolution of the surface electronic structure and surface material properties of a topological crystalline insulator (TCI) Pb1-xSnxSe as a function of various material parameters including composition x, temperature T and crystal structure. Our spectroscopic data demonstrate the electronic groundstate condition for the saddle point singularity, the tunability of surface chemical potential, and the surface states' response to circularly polarized light. Our results show that each material parameter can tune the system between trivial and topological phase in a distinct way unlike as seen in Bi2Se3 and related compounds, leading to a rich and unique topological phase diagram. Our systematic studies of the TCI Pb1-xSnxSe are valuable materials guide to realize new topological phenomena.

10 pages, 7 figures. Expanded version of arXiv:1403.1560

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• Disorder-Induced Weyl Semimetal Phase and Sequential Band Inversions in PbSe-SnSe Alloys
• Pressure-induced Superconductivity in Sulfur-doped SnSe Single Crystal Using Boron-doped Diamond Electrode-prefabricated Diamond Anvil Cell
• Observation of Ultrahigh Mobility Surface States in a Topological Crystalline Insulator by Infrared Spectroscopy
• Distinct multiple fermionic states in a single topological metal
• Topological nature of step edge states on the surface of topological crystalline insulator Pb${}_{0.7}$Sn${}_{0.3}$Se
• Engineering artificial topological phases via superlattices
• Signatures of van Hove singularities in the anisotropic in-plane optical conductivity of the topological semimetal Nb${}_3$SiTe${}_6$
• Direct observation of a photoinduced topological phase transition in Bi-doped (Pb,Sn)Se
• Fragility of the Dirac Cone Splitting in Topological Crystalline Insulator Heterostructures
• Alloy theory with atomic resolution for Rashba or topological systems
• Topological electronic structure of twin boundaries and twinning superlattices in the SnTe material class
• Reconstruction, rumpling, and Dirac states at the (001) surface of a topological crystalline insulator Pb1-xSnxSe
• Non-equilibrium States and Interactions in the Topological Insulator and Topological Crystalline Insulator Phases of NaCd4As3
• Anomalies in the temperature evolution of the Dirac states in a topological crystalline insulator SnTe
• Discovery of magnetic topological crystals
• Proximity-Induced Superconductivity in a Topological Crystalline Insulator