Two-dimensional Dirac fermions in a topological insulator: transport in the quantum limit

Details Two-dimensional Dirac fermions in a topological insulator: transport in the quantum limit Two-dimensional Dirac fermions in a topological insulator: transport in the quantum limit

2010-03-08

arxiv.org/abs/1003.1713v1

Nature Physics Volume: 6, Pages: 960-964 Year published: (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1038/NPHYS1861

Pulsed magnetic fields of up to 55T are used to investigate the transport properties of the topological insulator Bi_2Se_3 in the extreme quantum limit. For samples with a bulk carrier density of n = 2.9\times10^16cm^-3, the lowest Landau level of the bulk 3D Fermi surface is reached by a field of 4T. For fields well beyond this limit, Shubnikov-de Haas oscillations arising from quantization of the 2D surface state are observed, with the \nu =1 Landau level attained by a field of 35T. These measurements reveal the presence of additional oscillations which occur at fields corresponding to simple rational fractions of the integer Landau indices.

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