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Detection of the metallic Dirac electronic states on the surface ofTopological Insulators (TIs) is a tribune for a small number of experimentaltechniques the most prominent of which is Angle Resolved PhotoemissionSpectroscopy. However, there is no experimental method showing at atomic scaleresolution how the Dirac electrons extend inside TI systems. This is a criticalissue in the study of important surface quantum properties, especiallytopological quasiparticle excitations. Herein, by applying advancedDFT-assisted solid-state 125Te Nuclear Magnetic Resonance on Bi2Te3nanoplatelets, we succeeded in uncovering the hitherto invisible NMR signalswith magnetic shielding influenced by the Dirac electrons, and subsequentlyshowed how Dirac electrons spread and interact with the bulk interior of thenanoplatelets.

Direct observation of Dirac states in Bi2Te3 nanoplatelets by 125Te NMR