Abstract：
: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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Duan J,Tang N,He X,Yan Y,Zhang S,Qin X,Wang X,Yang X,Xu F,Chen Y,Ge W,Shen Bdoi
10.1038/srep04889subject
Has Abstractpub_date
2014-05-08 00:00:00pages
4889issn
2045-2322pii
srep04889journal_volume
4pub_type
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