Theoretical study of X-ray absorption of three-dimensional topological insulator ${\mathrm{Bi}}_2{\mathrm{Se}}_3$

Abstract

X-ray absorption edge singularity which is usually relevant for metals is studied for the prototype topological insulator ${\mathrm{Bi}}_2{\mathrm{Se}}_3$. The generalized integral equation of Nozières and Dominicis type for X-ray edge singularity is derived and solved. The spin texture of surfaces states causes a component of singularity dependent on the helicity of the spin texture. It also yields another component for which the singularity from excitonic processes is absent.

RevTeX 4.1. 4 pages, no figure

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