Anomalous nuclear magnetic resonance spectra in Bi$_2$Se$_3$ nanowires
  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. 
D. M. Nisson, A. P. Dioguardi, X. Peng, D. Yu, N. J. Curro
cond-mat.mtrl-sci