Experimental signature of a topological quantum dot

Marie S. Rider, Maria Sokolikova, S. M. Hanham, Miguel Navarro-Cia, Peter D Haynes, Derek Lee, Maddalena Daniele, Mariangela Cestelli Guidi, Cecilia Mattevi, Stefano Lupi, Giannini Vincenzo

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

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 languageEnglish
Pages (from-to)22817-22825
Number of pages9
JournalNanoscale
Volume12
Issue number44
Early online date4 Nov 2020
DOIs
Publication statusPublished - 28 Nov 2020

Keywords

  • topology
  • terahertz
  • plasmons
  • topological insulator
  • quantum theory
  • quantum dots

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