Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-12-19
Phys. Rev. B 81, 041405(R) (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
accepted for publication in Phys. Rev. B(R)
Scientific paper
10.1103/PhysRevB.81.041405
We report on angle resolved photoemission spectroscopic studies on a parent topological insulator (TI), Bi$_2$Se$_3$. The line width of the spectral function (inverse of the quasi-particle lifetime) of the topological metallic (TM) states shows an anomalous behavior. This behavior can be reasonably accounted for by assuming decay of the quasi-particles predominantly into bulk electronic states through electron-electron interaction and defect scattering. Studies on aged surfaces reveal that topological metallic states are very much unaffected by the potentials created by adsorbed atoms or molecules on the surface, indicating that topological states could be indeed protected against weak perturbations.
Hur Namjung
Jung Woo-Sung
Kim Chaehyun
Kim Chul
Kimura Sachie
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