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

Madhab Neupane , Su-Yang Xu , R. Sankar , Q. Gibson , Y. J. Wang , I. Belopolski , N. Alidoust , G. Bian

show 12 more authors

P. P. Shibayev D. S. Sanchez Y. Ohtsubo A. Taleb-Ibrahimi S. Basak W.-F. Tsai H. Lin Tomasz Durakiewicz R. J. Cava A. Bansil F. C. Chou M. Zahid Hasan

Authors on Pith no claims yet

classification ❄️ cond-mat.mes-hall cond-mat.mtrl-sci

keywords topologicalsurfacematerialphasecrystallinediagramelectronicinsulator

0 comments

read the original 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.

This paper has not been read by Pith yet.

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

discussion (0)