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arXiv · 1605.04051

Effect of Sb substitution on the Topological Surface States in Bi_{2}Se_{3} single crystals: a magneto-transport study

T. R. Devidas·E. P. Amaladass·Shilpam Sharma·Awadhesh Mani·R. Rajaraman·C. S. Sundar·A. Bharathi
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Abstract

Magneto-transport measurements have been carried out on Bi2-xSbxSe3 (x = 0, 0.05, 0.1, 0.3, 0.5) single crystals at 4.2 K temperature in the magnetic field range of -15 T to 15 T. Shubnikov-de Haas (SdH) oscillations of 2D nature were observed in samples with Sb concentration upto x = 0.3. The analyses of SdH oscillations observed in magneto-resistance data using Lifshitz-Kosevich equation reveal a systematic decrease in the Fermi surface area with Sb substitution. The Berry phase obtained from the Landau Level fan diagram suggests the occurrence of 2D oscillations arising from a Topological Surface State (TSS) for Sb concentrations of x = 0, 0.05 and 0.1; while 2D oscillation seen at higher Sb concentration is attributed to surface 2D electron gas consequent to downward band bending.

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T. R. Devidas, E. P. Amaladass, Shilpam Sharma, Awadhesh Mani, R. Rajaraman, C. S. Sundar, A. Bharathi. 2016-05-13. Effect of Sb substitution on the Topological Surface States in Bi_{2}Se_{3} single crystals: a magneto-transport study. https://arxiv.org/abs/1605.04051

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