| Autor: |
Rider MS; The Blackett Laboratory, Imperial College London, London SW7 2AZ, UK. marie.rider@ic.ac.uk., Sokolikova M, Hanham SM, Navarro-Cía M, Haynes PD, Lee DKK, Daniele M, Cestelli Guidi M, Mattevi C, Lupi S, Giannini V |
| Jazyk: |
angličtina |
| Zdroj: |
Nanoscale [Nanoscale] 2020 Nov 28; Vol. 12 (44), pp. 22817-22825. Date of Electronic Publication: 2020 Nov 11. |
| DOI: |
10.1039/d0nr06523d |
| Abstrakt: |
Topological insulator nanoparticles (TINPs) host topologically protected Dirac surface states, just like their bulk counterparts. For TINPs of radius <100 nm, quantum confinement on the surface results in the discretization of the Dirac cone. This system of discrete energy levels is referred to as a topological quantum dot (TQD) with energy level spacing on the order of Terahertz (THz), which is tunable with material-type and particle size. The presence of these discretized energy levels in turn leads to a new electron-mediated phonon-light coupling in the THz range, and the resulting mode can be observed in the absorption cross-section of the TINPs. We present the first experimental evidence of this new quantum phenomenon in Bi 2 Te 3 topological quantum dots, remarkably observed at room temperature. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
