Experimental realization of a three-dimensional topological insulator, Bi2Te3.
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.
Chen
Y L
YL
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
Analytis
J G
JG
Chu
J-H
JH
Liu
Z K
ZK
Mo
S-K
SK
Qi
X L
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Zhang
H J
HJ
Lu
D H
DH
Dai
X
X
Fang
Z
Z
Zhang
S C
SC
Fisher
I R
IR
Hussain
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Shen
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