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Experimental Realization of a Three-Dimensional Topological Insulator, Bi₂Te

by Liu, Z.K , Mo, S.-K , Fang, Z , Dai, X , Qi, X.L , Fisher, I.R , Hussain, Z , Shen, Z.-X , Chu, J.-H , Zhang, S.C , Analytis, J.G , Zhang, H.J , Chen, Y.L , Lu, D.H

in Doping / Electrons / energy / Fermions / Graphene / Hexagons / Materials / Mathematical surfaces / Odd numbers / Photons / spectroscopy / Topology

2009

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Experimental Realization of a Three-Dimensional Topological Insulator, Bi₂Te

by Liu, Z.K , Mo, S.-K , Fang, Z , Dai, X , Qi, X.L , Fisher, I.R , Hussain, Z , Shen, Z.-X , Chu, J.-H , Zhang, S.C , Analytis, J.G , Zhang, H.J , Chen, Y.L , Lu, D.H

in Doping / Electrons / energy / Fermions / Graphene / Hexagons / Materials / Mathematical surfaces / Odd numbers / Photons / spectroscopy / Topology

2009

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Experimental Realization of a Three-Dimensional Topological Insulator, Bi₂Te

by Liu, Z.K , Mo, S.-K , Fang, Z , Dai, X , Qi, X.L , Fisher, I.R , Hussain, Z , Shen, Z.-X , Chu, J.-H , Zhang, S.C , Analytis, J.G , Zhang, H.J , Chen, Y.L , Lu, D.H

in Doping / Electrons / energy / Fermions / Graphene / Hexagons / Materials / Mathematical surfaces / Odd numbers / Photons / spectroscopy / Topology

2009

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Journal Article

Experimental Realization of a Three-Dimensional Topological Insulator, Bi₂Te

Liu, Z.K,

Mo, S.-K,

Fang, Z,

Dai, X,

Qi, X.L,

Fisher, I.R,

Hussain, Z,

Shen, Z.-X,

Chu, J.-H,

Zhang, S.C,

Analytis, J.G,

Zhang, H.J,

Chen, Y.L,

Lu, D.H

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

Subject

/ energy