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Topological insulators (TIs) represent a novel quantum state of matter, characterized by edge or surface-states, showing up on the topological character of the bulk wave functions. Allowing electrons to move along their surface, but not through their inside, they emerged as an intriguing material platform for the exploration of exotic physical phenomena, somehow resembling the graphene Dirac-cone physics, as well as for exciting applications in optoelectronics, spintronics, nanoscience, low-power electronics, and quantum computing. Investigation of topological surface states (TSS) is conventionally hindered by the fact that in most of experimental conditions the TSS properties are mixed up with those of bulk-states. Here, we activate, probe, and exploit the collective electronic excitation of TSS in the Dirac cone. By engineering Bi2Te(3–x)Sex stoichiometry, and by gating the surface of nanoscale field-effect …
American Chemical Society
Publication date: 
13 Jan 2016

Leonardo Viti, Dominique Coquillat, Antonio Politano, Konstantin A Kokh, Ziya S Aliev, Mahammad B Babanly, Oleg E Tereshchenko, Wojciech Knap, Evgueni V Chulkov, Miriam S Vitiello

Biblio References: 
Volume: 16 Issue: 1 Pages: 80-87
Nano Letters