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

doi:10.1103/PhysRevLett.103.246601

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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345 Scopus citations

Abstract

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 language	English (US)
Article number	246601
Journal	Physical review letters
Volume	103
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.103.246601
State	Published - Dec 11 2009

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.103.246601

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title = "Quantum interference in macroscopic crystals of nonmetallic Bi2Se3",

abstract = "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.",

author = "Checkelsky, {J. G.} and Hor, {Y. S.} and Liu, {M. H.} and Qu, {D. X.} and Cava, {R. J.} and Ong, {N. P.}",

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AU - Checkelsky, J. G.

AU - Hor, Y. S.

AU - Liu, M. H.

AU - Qu, D. X.

AU - Cava, R. J.

AU - Ong, N. P.

PY - 2009/12/11

Y1 - 2009/12/11

N2 - 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.

AB - 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.

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Quantum interference in macroscopic crystals of nonmetallic Bi2Se3

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