Resolving Dirac electrons with broadband high-resolution NMR

Wassilios Papawassiliou, Aleksander Jaworski, Andrew J. Pell (), Jae Hyuck Jang, Yeonho Kim, Sang-Chul Lee, Hae Jin Kim (), Yasser Alwahedi, Saeed Alhassan, Ahmed Subrati, Michael Fardis, Marina Karagianni, Nikolaos Panopoulos, Janez Dolinšek and Georgios Papavassiliou ()
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Wassilios Papawassiliou: Stockholm University
Aleksander Jaworski: Stockholm University
Andrew J. Pell: Stockholm University
Jae Hyuck Jang: Korea Basic Science Institute
Yeonho Kim: Korea Basic Science Institute
Sang-Chul Lee: Korea Basic Science Institute
Hae Jin Kim: Korea Basic Science Institute
Yasser Alwahedi: Khalifa University
Saeed Alhassan: Khalifa University
Ahmed Subrati: Khalifa University
Michael Fardis: National Center for Scientific Research “Demokritos”
Marina Karagianni: National Center for Scientific Research “Demokritos”
Nikolaos Panopoulos: National Center for Scientific Research “Demokritos”
Janez Dolinšek: Faculty of Mathematics and Physics
Georgios Papavassiliou: National Center for Scientific Research “Demokritos”

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-14838-4

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