| Literature DB >> 19520912 |
Y L Chen1, J G Analytis, J-H Chu, Z K Liu, S-K Mo, X L Qi, H J Zhang, D H Lu, X Dai, Z Fang, S C Zhang, I R Fisher, Z Hussain, Z-X Shen.
Abstract
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.Entities:
Year: 2009 PMID： 19520912 DOI： 10.1126/science.1173034
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728