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. This journal is
Experimental signature of a topological quantum dot / Rider, M. S.; Sokolikova, M.; Hanham, S. M.; Navarro-Cia, M.; Haynes, P. D.; Lee, D. K. K.; Daniele, M.; Cestelli Guidi, M.; Mattevi, C.; Lupi, S.; Giannini, V.. - In: NANOSCALE. - ISSN 2040-3364. - 12:44(2020), pp. 22817-22825. [10.1039/d0nr06523d]
Experimental signature of a topological quantum dot
Lupi S.;
2020
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. This journal is| File | Dimensione | Formato | |
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