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Resolving Dirac electrons with broadband high-resolution NMR.

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Papawassiliou W,Jaworski A,Pell AJ,Jang JH,Kim Y,Lee SC,Kim HJ,Alwahedi Y,Alhassan S,Subrati A,Fardis M,Karagianni M,Panopoulos N,Dolinšek J,Papavassiliou G

doi

10.1038/s41467-020-14838-4

subject

Has Abstract

pub_date

2020-03-09 00:00:00

pages

1285

issue

1

issn

2041-1723

pii

10.1038/s41467-020-14838-4

journal_volume

11

pub_type

杂志文章

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