Effects of spin-dependent electronic correlations on surface states in 
topological insulators

Toklikishvili, Z.; Chotorlishvili, L.; Stagraczynski, S.; Dugaev, V. K.; Ernst, A.; Barnas, J.; Berakdar, J.

doi:10.1103/PhysRevB.100.235419

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Effects of spin-dependent electronic correlations on surface states in topological insulators

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Ernst, A.
Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1103/PhysRevB.100.235419
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Citation

Toklikishvili, Z., Chotorlishvili, L., Stagraczynski, S., Dugaev, V. K., Ernst, A., Barnas, J., et al. (2019). Effects of spin-dependent electronic correlations on surface states in topological insulators. Physical Review B, 100(23): 235419. doi:10.1103/PhysRevB.100.235419.

Cite as: https://hdl.handle.net/21.11116/0000-0009-0C8E-B

Abstract

The effect of electron-electron interactions on the energy spectrum of surface electrons in a three-dimensional topological insulator is studied theoretically. The interaction includes both charge- and spin-dependent correlations. Using the Green's function method, we calculate the electron self-energy and determine the renormalized spin-orbit coupling strength. We find that the energy spectrum renormalized by spin-dependent electronic correlation turns nonlinear with respect to the wave vector k measured from the perfect Dirac cone (in the absence of electron-electron interactions). We also discuss charge screening contributions from surface and bulk electrons.