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- Title
Anomalous Photoelectric Effect of a Polycrystalline Topological Insulator Film.
- Authors
Hongbin Zhang; Jiandong Yao; Jianmei Shao; Hai Li; Shuwei Li; Dinghua Bao; Chengxin Wang; Guowei Yang
- Abstract
A topological insulator represents a new state of quantum matter that possesses an insulating bulk band gap as well as a spin-momentum-locked Dirac cone on the surface that is protected by time-reversal symmetry. Photon-dressed surface states and light-induced surface photocurrents have been observed in topological insulators. Here, we report experimental observations of an anomalous photoelectric effect in thin films of Bi2Te3, a polycrystalline topological insulator. Under illumination with non-polarised light, transport measurements reveal that the resistance of the topological surface states suddenly increases when the polycrystalline film is illuminated. The resistance variation is positively dependent on the light intensity but has no relation to the applied electric field; this finding can be attributed to the gap opening of the surface Dirac cone. This observation of an anomalous photoelectric effect in polycrystalline topological insulators offers exciting opportunities for the creation of photodetectors with an unusually broad spectral range. Moreover, polycrystalline topological insulator films provide an attractive material platform for exploring the nature and practical application of topological insulators.
- Subjects
PHOTOELECTRIC effect; PHOTOEMISSION; POLYCRYSTALLINE semiconductors; ELECTRIC insulators &; insulation; PHOTOCURRENTS; PHOTOELECTRICITY
- Publication
Scientific Reports, 2014, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep05876