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VOLUME 113 | ISSUE 4 | PAGE 265
To the inhomogeneous bulk state of the Bi1.08Sn0.02Sb0.9Te2S topological insulator as revealed by ESR of the charge carriers
We report first observation of electron spin resonance of the bulk charge carriers in 3D topological insulator Bi1.08Sn0.02Sb0.9Te2S. The observed spectra represent the overlay of two different signals from electrons and holes with the g-factors enormously enhanced due to strong spin-orbit coupling typical for topological insulators. The analysis of the ESR lines indicates that the current carriers responsible for the resonance may be organized in nanosize electron and hole droplets. It is not excluded that such droplets when residing near the surface may give rise to nonzero back scattering of surface current carriers.