Details

Autor(en) / Beteiligte

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

Titel

Experimental Realization of a Three-Dimensional Topological Insulator, Bi2Te3

Ist Teil von

• Science (American Association for the Advancement of Science), 2009-07, Vol.325 (5937), p.178-181

Ort / Verlag

Washington, DC: American Association for the Advancement of Science

Erscheinungsjahr

2009

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.