${}^{77}$Se nuclear magnetic resonance of topological insulator Bi${}_2$Se${}_3$

Abstract

Topological insulators (TIs) constitute a new class of materials with an energy gap in the bulk and peculiar metallic states on the surface. To date, most experiments have focused on probing the surface electronic structure of these materials. Here, we report on new and potentially interesting features resulting from the bulk electronic structure. Our findings are based on a comprehensive nuclear magnetic resonance (NMR) study of ${}^{77}$Se on Bi${}_2$Se${}_3$ and Cu${}_{0.15}$Bi${}_2$Se${}_3$ single crystals. First, we find two resonance lines and show that they originate from the two inequivalent Se lattice sites. Second, we observe unusual field-independent linewidths, and attribute them to an unexpectedly strong internuclear coupling mediated by bulk electrons. These results call for a revision of earlier NMR studies and add insight into the bulk electronic properties of TIs.

5 pages, 4 figures

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• NMR in an electric field: A bulk probe of the hidden spin and orbital polarizations
• Field induced charge symmetry in topological insulator Bi${}_2$Te${}_3$ revealed by nuclear magnetic resonance
• Resistively detected NMR as a probe of the topological nature of conducting edge/surface states
• 125Te spin-lattice relaxation in a candidate to Weyl semimetals WTe2