Article

Surface spectral function of momentum-dependent pairing potentials in a topological insulator: application to CuxBi2Se3.

Institute for Theoretical Physics and Department of Modern Physics, University of Science and Technology of China, Hefei, 230026, People's Republic of China. Beijing Computational Science Research Center, Beijing 100084, People's Republic of China.
Journal of Physics Condensed Matter (impact factor: 2.55). 05/2013; 25(21):215702. DOI:10.1088/0953-8984/25/21/215702 pp.215702
Source: PubMed

ABSTRACT We propose three possible momentum-dependent pairing potentials as candidates for topological superconductors (for example CuxBi2Se3), and calculate the surface spectral function and surface density of states with these pairing potentials. We find that the first two can give the same spectral functions as the fully gapped and node-contacted pairing potentials given by Fu and Berg (2010 Phys. Rev. Lett. 105 097001), and that the third one can obtain a topological non-trivial case in which there exists a flat Andreev bound state and which preserves the threefold rotation symmetry. We hope our proposals and results will be assessed by future experiment.

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Keywords

Berg
 
node-contacted pairing potentials
 
pairing potentials
 
possible momentum-dependent pairing potentials
 
proposals
 
spectral functions
 
surface spectral function
 
threefold rotation symmetry
 
topological non-trivial case
 
topological superconductors
 

Liang Chen