Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Topological insulators (TIs) represent a new quantum phase of matter with a Dirac cone-like conducting surface state that shows time-reversal protection from backscattering due to spin-momentum-locking.Recently, some studies demonstrate that helicity-dependent photocurrent on TIs can be manipulated by the polarization of incident light. Reversing the helicity of circular polarized light reverses the direction of the helicity-dependent photocurrent. These works highlight the potential of TIs on applications of spintronics in the future.Here we demonstrate the terahertz (THz) emission spectroscopy of Sb2Te3 nano thin film under the excitation of ultrafast optical pulses of different helicity. In the oblique optical incidences, the polarity-reversals of the emitted THz waveform were observed as the polarization of optical pulse was changed from right-hand-circular-polarization to left-hand-circular-polarization. The helicity of optical pulses changes from +1 to -1 as well. In normal optical incident, no polarity-reversal of THz waveform was observed. A model based on transient photocurrent and optical rectification describes the experimental results very well. Comparing with the recent results on photocurrent measurements, we believe the phenomena are strongly related to the spin-polarized current on the surface of TIs.
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