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We report the quantum transport studies on Bi 2 Se 3  single crystal with bulk carrier concentration of ∼10 19  cm –3 . The Bi 2 Se 3  crystal exhibits metallic character, and at low temperatures, the field dependence of resistivity shows clear Shubnikov–de Haas (SdH) oscillations above 6 T. The analysis of these oscillations through Lifshitz–Kosevich theory reveals a non‐trivial π Berry phase coming from three‐dimensional (3D) Fermi surface, which is a strong signature of Dirac fermions with three‐dimensional dispersion. The large Dingle temperature and non zero slope of Williamson–Hall plot suggest the presence of enhanced local strain field in our system which possibly transforms the regions of topological insulator to 3D Dirac fermion metal state. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)

Observation of π Berry phase in quantum oscillations of three‐dimensional Fermi surface in topological insulator Bi 2 Se 3