Control of Terahertz Emission by Ultrafast Spin-Charge Current Conversion at Rashba Interfaces

Jungfleisch, Matthias B.; Zhang, Qi; Zhang, Wei; Pearson, John E.; Schaller, Richard D.; Wen, Haidan; Hoffmann, Axel

doi:10.1103/PhysRevLett.120.207207

Title: Control of Terahertz Emission by Ultrafast Spin-Charge Current Conversion at Rashba Interfaces

Journal Article · Fri May 18 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.120.207207· OSTI ID:1444105

Jungfleisch, Matthias B. ^[1]; Zhang, Qi ^[2]; Zhang, Wei ^[3]; Pearson, John E. ^[2]; Schaller, Richard D. ^[4]; Wen, Haidan ^[2]; Hoffmann, Axel ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Delaware, Newark, DE (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Oakland Univ., Rochester, MI (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)

Here, we show that a femtosecond spin-current pulse can generate terahertz (THz) transients at Rashba interfaces between two nonmagnetic materials. Our results unambiguously demonstrate the importance of the interface in this conversion process that we interpret in terms of the inverse Rashba Edelstein effect, in contrast to the THz emission in the bulk conversion process via the inverse spin-Hall effect. Furthermore, we show that at Rashba interfaces the THz-field amplitude can be controlled by the helicity of the light. The optical generation of electric photocurrents by these interfacial effects in the femtosecond regime will open up new opportunities in ultrafast spintronics.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; SC0012509

OSTI ID:: 1444105

Alternate ID(s):: OSTI ID: 1437690

Journal Information:: Physical Review Letters, Vol. 120, Issue 20; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 84 works

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