Ultrafast Spin-to-Charge Conversion at the Surface of Topological Insulator Thin Films

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 30(2018), 52 vom: 15. Dez., Seite e1802356
1. Verfasser: Wang, Xinbo (VerfasserIn)
Weitere Verfasser: Cheng, Liang, Zhu, Dapeng, Wu, Yang, Chen, Mengji, Wang, Yi, Zhao, Daming, Boothroyd, Chris B, Lam, Yeng Ming, Zhu, Jian-Xin, Battiato, Marco, Song, Justin C W, Yang, Hyunsoo, Chia, Elbert E M
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2018
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article spin-to-charge conversion spintronics surface states terahertz emission spectroscopy topological insulators
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520 |a Strong spin-orbit coupling, resulting in the formation of spin-momentum-locked surface states, endows topological insulators with superior spin-to-charge conversion characteristics, though the dynamics that govern it have remained elusive. Here, an all-optical method is presented, which enables unprecedented tracking of the ultrafast dynamics of spin-to-charge conversion in a prototypical topological insulator Bi2 Se3 /ferromagnetic Co heterostructure, down to the sub-picosecond timescale. Compared to pure Bi2 Se3 or Co, a giant terahertz emission is observed in the heterostructure that originates from spin-to-charge conversion, in which the topological surface states play a crucial role. A 0.12 ps timescale is identified that sets a technological speed limit of spin-to-charge conversion processes in topological insulators. In addition, it is shown that the spin-to-charge conversion efficiency is temperature independent in Bi2 Se3 as expected from the nature of the surface states, paving the way for designing next-generation high-speed optospintronic devices based on topological insulators at room temperature 
650 4 |a Journal Article 
650 4 |a spin-to-charge conversion 
650 4 |a spintronics 
650 4 |a surface states 
650 4 |a terahertz emission spectroscopy 
650 4 |a topological insulators 
700 1 |a Cheng, Liang  |e verfasserin  |4 aut 
700 1 |a Zhu, Dapeng  |e verfasserin  |4 aut 
700 1 |a Wu, Yang  |e verfasserin  |4 aut 
700 1 |a Chen, Mengji  |e verfasserin  |4 aut 
700 1 |a Wang, Yi  |e verfasserin  |4 aut 
700 1 |a Zhao, Daming  |e verfasserin  |4 aut 
700 1 |a Boothroyd, Chris B  |e verfasserin  |4 aut 
700 1 |a Lam, Yeng Ming  |e verfasserin  |4 aut 
700 1 |a Zhu, Jian-Xin  |e verfasserin  |4 aut 
700 1 |a Battiato, Marco  |e verfasserin  |4 aut 
700 1 |a Song, Justin C W  |e verfasserin  |4 aut 
700 1 |a Yang, Hyunsoo  |e verfasserin  |4 aut 
700 1 |a Chia, Elbert E M  |e verfasserin  |4 aut 
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