Quantum interference in macroscopic crystals of nonmetallic Bi2Se3

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

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337 Scopus citations


Photoemission experiments have shown that Bi2Se3 is a topological insulator. By controlled doping, we have obtained crystals of Bi2Se3 with nonmetallic 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× larger than expected from universal conductance fluctuations. The results point to very long phase-breaking lengths in an unusual conductance channel in these nonmetallic samples. We discuss the nature of the in-gap conducting states and their relation to the topological surface states.

Original languageEnglish (US)
Article number246601
JournalPhysical review letters
Issue number24
StatePublished - Dec 11 2009

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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