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arXiv · 1106.2318

Anomalously enhanced photoemission from the Dirac point and symmetry of the self-energy variations for the surface states in Bi2Se3

A. A. Kordyuk·V. B. Zabolotnyy·D. V. Evtushinsky·T. K. Kim·B. Buechner·I. V. Plyushchay·H. Berger·S. V. Borisenko
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Abstract

Accurate analysis of the photoemission intensity from the surface states of Bi2Se3 reveals two unusual features: spectral line asymmetry and anomalously enhanced photoemission from the Dirac point. The former indicates a certain symmetry of a scattering process, which results in strongly kω-dependent contribution to the imaginary part of the self-energy that changes sign while crossing both the dispersion curves and the energy of the Dirac point. The latter is hard to describe by one particle spectral function while a final state interference seems to be plausible explanation.

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A. A. Kordyuk, V. B. Zabolotnyy, D. V. Evtushinsky, T. K. Kim, B. Buechner, I. V. Plyushchay, H. Berger, S. V. Borisenko. 2012-02-15. Anomalously enhanced photoemission from the Dirac point and symmetry of the self-energy variations for the surface states in Bi2Se3. https://doi.org/10.1103/physrevb.85.075414

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