Anomalous nuclear magnetic resonance spectra in Bi${}_2$Se${}_3$ nanowires

Abstract

We report ${}^{209}$Bi nuclear magnetic resonance (NMR) spectra of in nanowires and single crystals of Bi${}_2$Se${}_3$. Crystals were powdered to simulate the random orientation of the nanowires, and the spectra are compared with theoretical expectations derived via an orientational study of a single crystal. The nanowire spectra are consistent with the randomly oriented powders, however we find an unusual suppression of signal intensity as a function of field orientation that may be associated with screening by surface currents.

7 pages, 8 figures, to appear in Phys. Rev. B