Experimental signature of a topological quantum dot
Research output: Contribution to journal › Article › peer-review
- Imperial College London
- University of Rome 'La Sapienza'
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 Bi2Te3 topological quantum dots, remarkably observed at room temperature.
|Number of pages||9|
|Early online date||4 Nov 2020|
|Publication status||Published - 28 Nov 2020|
- topology, terahertz, plasmons, topological insulator, quantum theory, quantum dots