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Broadband terahertz generation via the interface inverse Rashba-Edelstein effect

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arxiv 1804.04765 v1 pith:AXECJSFJ submitted 2018-04-13 cond-mat.mtrl-sci

C. Zhou , Y. P. Liu , Z. Wang , S. J. Ma , M. W. Jia , R.Q. Wu , L. Zhou , W. Zhang
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M. K. Liu Y. Z. Wu J. Qi
This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords broadbandemissioninterfaceeffectinverseradiationrashba-edelsteinrecently
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Novel mechanisms for electromagnetic wave emission in the terahertz (THz) frequency regime emerging at the nanometer scale have recently attracted intense attention for the purpose of searching next-generation broadband THz emitters. Here, we report a new mechanism for broadband THz emission, utilizing the interface inverse Rashba-Edelstein effect. By engineering the symmetry of the Ag/Bi Rashba interface, we demonstrate a controllable THz radiation (~0.1-5 THz) waveform emitted from metallic Fe/Ag/Bi heterostructures following photo-excitation. We further reveal that this type of THz radiation can be selectively superimposed on the emission discovered recently due to the inverse Spin Hall effect, yielding a unique film thickness dependent emission pattern. Our results thus offer new opportunities for versatile broadband THz radiation using the interface quantum effects.

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