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Experimental Realization of a Three-Dimensional Topological Insulator, Bi2Te3

by DAI, X , QI, X. L , CHU, J.-H , MO, S.-K , LU, D. H , ZHANG, H. J , LIU, Z. K , ANALYTIS, J. G , CHEN, Y. L , FISHER, I. R , HUSSAIN, Z , SHEN, Z.-X , FANG, Z , ZHANG, S. C

in Condensed matter: electronic structure, electrical, magnetic, and optical properties / Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures / Exact sciences and technology / High temperature / Materials science / Physics / Quantum theory / Spectrum analysis / Surface and interface electron states / Surface states, band structure, electron density of states / Temperature

2009

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Experimental Realization of a Three-Dimensional Topological Insulator, Bi2Te3

by DAI, X , QI, X. L , CHU, J.-H , MO, S.-K , LU, D. H , ZHANG, H. J , LIU, Z. K , ANALYTIS, J. G , CHEN, Y. L , FISHER, I. R , HUSSAIN, Z , SHEN, Z.-X , FANG, Z , ZHANG, S. C

2009

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Experimental Realization of a Three-Dimensional Topological Insulator, Bi2Te3

by DAI, X , QI, X. L , CHU, J.-H , MO, S.-K , LU, D. H , ZHANG, H. J , LIU, Z. K , ANALYTIS, J. G , CHEN, Y. L , FISHER, I. R , HUSSAIN, Z , SHEN, Z.-X , FANG, Z , ZHANG, S. C

2009

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Journal Article

Experimental Realization of a Three-Dimensional Topological Insulator, Bi2Te3

DAI, X,

QI, X. L,

CHU, J.-H,

MO, S.-K,

LU, D. H,

ZHANG, H. J,

LIU, Z. K,

ANALYTIS, J. G,

CHEN, Y. L,

FISHER, I. R,

HUSSAIN, Z,

SHEN, Z.-X,

FANG, Z,

ZHANG, S. C

2009

Overview

Three-dimensional topological insulators are a new state of quantum matter with a bulk gap and odd number of relativistic Dirac fermions on the surface. By investigating the surface state of Bi2Te3 with angle-resolved photoemission spectroscopy, we demonstrate that the surface state consists of a single nondegenerate Dirac cone. Furthermore, with appropriate hole doping, the Fermi level can be tuned to intersect only the surface states, indicating a full energy gap for the bulk states. Our results establish that Bi2Te3 is a simple model system for the three-dimensional topological insulator with a single Dirac cone on the surface. The large bulk gap of Bi2Te3 also points to promising potential for high-temperature spintronics applications.

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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science

Subject

Condensed matter: electronic structure, electrical, magnetic, and optical properties

/ Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures

/ Exact sciences and technology

/ High temperature

/ Materials science

/ Physics

/ Quantum theory