NDLI: Topologically protected Dirac plasmons and their evolution across the quantum phase transition in a (Bi1−xInx)2Se3 topological insulator

Content Provider	Royal Society of Chemistry (RSC)
Author	Apuzzo, Fausto D’ Ortolani, Michele Autore, Marta Giorgianni, Flavio Oh, Seongshik Lupi, Stefano Koirala, Nikesh Schade, Urlich Gaspare, Alessandra Di Brahlek, Matthew Vecchio, Irene Lo
Copyright Year	2016
Abstract	A 3D Topological Insulator (TI) is an intrinsically stratified electronic material characterized by an insulating bulk and Dirac free electrons at the interface with vacuum or another dielectric. In this paper, we investigate, through terahertz (THz) spectroscopy, the plasmon excitation of Dirac electrons on thin films of (Bi1−xInx)2Se3 TI patterned in the form of a micro-ribbon array, across a Quantum Phase Transition (QPT) from the topological to a trivial insulating phase. The latter is achieved by In doping onto the Bi-site and is characterized by massive electrons at the surface. While the plasmon frequency is nearly independent of In content, the plasmon width undergoes a sudden broadening across the QPT, perfectly mirroring the single particle (free electron) behavior as measured on the same films. This strongly suggests that the topological protection from backscattering characterizing Dirac electrons in the topological phase extends also to their plasmon excitations.
Starting Page	4667
Ending Page	4671
Page Count	5
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	8
Issue Number	8
Journal	Nanoscale
DOI	10.1039/c5nr02976g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Dirac Texas Instruments Spectroscopy Topological order Terahertz radiation Dopant Dimension Dielectric Quantum Phase Transition Phase transition Plasma oscillation
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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