Quantum interference in macroscopic crystals of non-metallic Bi$_2$Se$_3$

J. G. Checkelsky; Y. S. Hor; M. -H. Liu; D. -X. Qu; R. J. Cava; N. P. Ong

doi:10.1103/PhysRevLett.103.246601

Quantum interference in macroscopic crystals of non-metallic Bi$_2$Se$_3$

Mesoscale and Nanoscale Physics 2009-12-15 v2

Authors: J. G. Checkelsky , Y. S. Hor , M. -H. Liu , D. -X. Qu , R. J. Cava , N. P. Ong

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Abstract

Photoemission experiments have shown that Bi $_2$ Se $_3$ is a topological insulator. By controlled doping, we have obtained crystals of Bi $_2$ Se $_3$ with non-metallic conduction. At low temperatures, we uncover a novel type of magnetofingerprint signal which involves the spin degrees of freedom. Given the mm-sized crystals, the observed amplitude is 200-500 $\times$ larger than expected from universal conductance fluctuations. The results point to very long phase breaking lengths in an unusual conductance channel in these non-metallic samples. We discuss the nature of the in-gap conducting states and their relation to the topological surface states.

Keywords

topological insulator bismuth selenide quantum interference magnetofingerprint universal conductance fluctuations surface states phase coherence

Cite

@article{arxiv.0909.1840,
  title  = {Quantum interference in macroscopic crystals of non-metallic Bi$_2$Se$_3$},
  author = {J. G. Checkelsky and Y. S. Hor and M. -H. Liu and D. -X. Qu and R. J. Cava and N. P. Ong},
  journal= {arXiv preprint arXiv:0909.1840},
  year   = {2009}
}

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4 pages, 4 figures, changes in text in final paragraph

Quantum interference in macroscopic crystals of non-metallic Bi$_2$Se$_3$

Abstract

Keywords

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