Abstract
The spin-to-charge conversion of the interface is studied in a device in which a spin current can be injected from either side selectively. The charge voltages generated by the two counterpropagating spin currents show opposite signs, that is consistent with the inverse spin Hall effect rather than the well-accepted inverse Rashba-Eldestein effect in the bilayer. Femtosecond laser is further employed to generate the spin-current-induced terahertz signal in a bilayer, which shows no evidence for the inverse Rashba-Eldestein effect, either. This work provides a clear-cut method to identify the spin-to-charge mechanism in a Rashba electronic state and delivers new understanding for the relevant spin-transport phenomena.
- Received 6 January 2021
- Revised 15 March 2021
- Accepted 13 April 2021
DOI:https://doi.org/10.1103/PhysRevLett.126.197201
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