The optical and plasmonic properties of (Bi,Sb)2(Te,Se)3 trichalcogenide topological insulator crystals are studied systematically by first-principles density functional theory. These materials exhibit bulk plasmonic properties, dominated by interband transitions, which are better than gold and silver at blue and UV wavelengths. Moreover, topologically protected surface states are also capable of supporting propagating plasmon polariton modes over an extremely broad spectral range, due to a combination of interband and intraband transitions.
- Jun Yin
- Harish NS Krishnamoorthy
- Cesare Soci
