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Identification of Helicity-Dependent Photocurrents from Topological Surface States in Bi(2)Se(3) Gated by Ionic Liquid

Dirac-like surface states on surfaces of topological insulators have a chiral spin structure with spin locked to momentum, which is interesting in physics and may also have important applications in spintronics. In this work, by measuring the tunable helicity-dependent photocurrent (HDP), we present...

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Detalles Bibliográficos
Autores principales: Duan, Junxi, Tang, Ning, He, Xin, Yan, Yuan, Zhang, Shan, Qin, Xudong, Wang, Xinqiang, Yang, Xuelin, Xu, Fujun, Chen, Yonghai, Ge, Weikun, Shen, Bo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4013928/
https://www.ncbi.nlm.nih.gov/pubmed/24809330
http://dx.doi.org/10.1038/srep04889
Descripción
Sumario:Dirac-like surface states on surfaces of topological insulators have a chiral spin structure with spin locked to momentum, which is interesting in physics and may also have important applications in spintronics. In this work, by measuring the tunable helicity-dependent photocurrent (HDP), we present an identification of the HDP from the Dirac-like surface states at room temperature. It turns out that the total HDP has two components, one from the Dirac-like surface states, and the other from the surface accumulation layer. These two components have opposite directions. The clear gate tuning of the electron density as well as the HDP signal indicates that the surface band bending and resulted surface accumulation are successfully modulated by the applied ionic liquid gate, which provides a promising way to the study of the Dirac-like surface states and also potential applications in spintronic devices.