Resolving Dirac electrons with broadband high-resolution NMR.

Nature Communications
Wassilios PapawassiliouGeorgios Papavassiliou

Abstract

Detecting the metallic Dirac electronic states on the surface of Topological Insulators (TIs) is critical for the study of important surface quantum properties (SQPs), such as Majorana zero modes, where simultaneous probing of the bulk and edge electron states is required. However, there is a particular shortage of experimental methods, showing at atomic resolution how Dirac electrons extend and interact with the bulk interior of nanoscaled TI systems. Herein, by applying advanced broadband solid-state 125Te nuclear magnetic resonance (NMR) methods on Bi2Te3 nanoplatelets, we succeeded in uncovering the hitherto invisible NMR signals with magnetic shielding that is influenced by the Dirac electrons, and we subsequently showed how the Dirac electrons spread inside the nanoplatelets. In this way, the spin and orbital magnetic susceptibilities induced by the bulk and edge electron states were simultaneously measured at atomic scale resolution, providing a pertinent experimental approach in the study of SQPs.

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Citations

Jan 23, 2021·Journal of Magnetic Resonance·José P Carvalho, Andrew J Pell
Jul 17, 2021·Nature Communications·Wassilios PapawassiliouAndrew J Pell

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Methods Mentioned

BETA
NMR
Scanning electron microscopy
X-ray

Software Mentioned

Wien2k DFT
Wien2k
QUANTUM ESPRESSO
FULLPROF
nmr

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