Nuclear magnetic resonance as a probe of electronic states of Bi2Se3

Article

关键词: SPIN-LATTICE-RELAXATION;    SINGLE DIRAC CONE;    TOPOLOGICAL INSULATORS;    CRYSTALS;    SURFACE;    BISMUTH;    BI2TE3;    METAL;    GAP;   

DOI  :  10.1103/PhysRevB.87.195202

来源: SCIE

【 摘 要 】

We present magnetotransport and Bi-209 nuclear magnetic resonance (NMR) data on a series of single crystals of Bi2Se3, Bi2Te2Se, and Cu x Bi2Se3 with varying carrier concentrations. The Knight shift of the bulk nuclei is strongly correlated with the carrier concentration via a hyperfine coupling of 27 mu eV, which may have important consequences for scattering of the protected surface states. Surprisingly we find that the NMR linewidths and the spin-lattice relaxation rate appear to be dominated by the presence of localized spins, which may be related to the presence of Se vacancies.

【 授权许可】

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