Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi2Se3

Marco Bianchi, Dandan Guan, Shining Bao, Jianli Mi, Bo Brummerstedt Iversen, Philip D.C. King and Philip Hofmann ()
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Marco Bianchi: Interdisciplinary Nanoscience Center, Aarhus University
Dandan Guan: Interdisciplinary Nanoscience Center, Aarhus University
Shining Bao: Zhejiang University
Jianli Mi: Center for Materials Crystallography, Interdisciplinary Nanoscience Center, Aarhus University
Bo Brummerstedt Iversen: Center for Materials Crystallography, Interdisciplinary Nanoscience Center, Aarhus University
Philip D.C. King: School of Physics and Astronomy, University of St Andrews
Philip Hofmann: Interdisciplinary Nanoscience Center, Aarhus University

Nature Communications, 2010, vol. 1, issue 1, 1-5

Abstract: Abstract The surface of a topological insulator plays host to an odd number of linearly-dispersing Dirac fermions, protected against back-scattering by time-reversal symmetry. Such characteristics make these materials attractive not only for studying a range of fundamental phenomena in both condensed matter and particle physics, but also for applications ranging from spintronics to quantum computation. Here, we show that the single Dirac cone comprising the topological state of the prototypical topological insulator Bi2Se3 can co-exist with a two-dimensional electron gas (2DEG), a cornerstone of conventional electronics. Creation of the 2DEG is tied to a surface band-bending effect, which should be general for narrow-gap topological insulators. This leads to the unique situation where a topological and a non-topological, easily tunable and potentially superconducting, metallic state are confined to the same region of space.

Date: 2010
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DOI: 10.1038/ncomms1131

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