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

Abstract

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.

Authors:
 [1];  [2];  [3];  [2];  [4];  [2];  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Delaware, Newark, DE (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Oakland Univ., Rochester, MI (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1444105
Alternate Identifier(s):
OSTI ID: 1437690
Grant/Contract Number:  
[AC02-06CH11357; SC0012509]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
[ Journal Volume: 120; Journal Issue: 20]; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Jungfleisch, Matthias B., Zhang, Qi, Zhang, Wei, Pearson, John E., Schaller, Richard D., Wen, Haidan, and Hoffmann, Axel. Control of Terahertz Emission by Ultrafast Spin-Charge Current Conversion at Rashba Interfaces. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.207207.
Jungfleisch, Matthias B., Zhang, Qi, Zhang, Wei, Pearson, John E., Schaller, Richard D., Wen, Haidan, & Hoffmann, Axel. Control of Terahertz Emission by Ultrafast Spin-Charge Current Conversion at Rashba Interfaces. United States. doi:10.1103/PhysRevLett.120.207207.
Jungfleisch, Matthias B., Zhang, Qi, Zhang, Wei, Pearson, John E., Schaller, Richard D., Wen, Haidan, and Hoffmann, Axel. Fri . "Control of Terahertz Emission by Ultrafast Spin-Charge Current Conversion at Rashba Interfaces". United States. doi:10.1103/PhysRevLett.120.207207. https://www.osti.gov/servlets/purl/1444105.
@article{osti_1444105,
title = {Control of Terahertz Emission by Ultrafast Spin-Charge Current Conversion at Rashba Interfaces},
author = {Jungfleisch, Matthias B. and Zhang, Qi and Zhang, Wei and Pearson, John E. and Schaller, Richard D. and Wen, Haidan and Hoffmann, Axel},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.120.207207},
journal = {Physical Review Letters},
number = [20],
volume = [120],
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 7 works
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Figures / Tables:

FIG. 1 FIG. 1: (Color online) Experimental schematics and sketch of THz emission in bilayer samples, (a), and trilayer samples, where the spin-to-charge current conversion occurs at the Rashba interface between Ag and Bi, (b). The MgO substrate is facing perpendicularly to the incident femtosecond laser pulse and the magnetization M ismore » lying perpendicularly to the x-component of the THz-electric field, Ex. The amplitude of Ex generated from the bilayer emitter, (a), is smaller than for the trilayer emitter, (b). (c) Illustration of the inverse Rashba Edelstein effect: Generation of a charge current carried by the interfacial states is due to a nonzero spin density induced by a ultrafast, pulsed spin current injection.« less

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