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Abstract
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.
Original language | English |
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Pages (from-to) | 22817-22825 |
Number of pages | 9 |
Journal | Nanoscale |
Volume | 12 |
Issue number | 44 |
Early online date | 4 Nov 2020 |
DOIs | |
Publication status | Published - 28 Nov 2020 |
Keywords
- plasmons
- quantum dots
- quantum theory
- terahertz
- topological insulator
- topology
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Dive into the research topics of 'Experimental signature of a topological quantum dot'. Together they form a unique fingerprint.Projects
- 1 Finished
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THEIA: fast super-resolution TeraHErtz mIcroscopy for nAtural Sciences
Engineering & Physical Science Research Council
1/08/19 → 31/03/21
Project: Research