Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-05-24
Physical Review B, Vol. 83, 193107 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
RevTeX 4.1. 4 pages, no figure
Scientific paper
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 Nozi\`eres 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.
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