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Title: Electrical detection of current generated spin in topological insulator surface states: Role of interface resistance

Abstract

Current generated spin polarization in topological insulator (TI) surface states due to spin-momentum locking has been detected recently using ferromagnet/tunnel barrier contacts, where the projection of the TI spin onto the magnetization of the ferromagnet is measured as a voltage. However, opposing signs of the spin voltage have been reported, which had been tentatively attributed to the coexistence of trivial two-dimensional electron gas states on the TI surface which may exhibit opposite current-induced polarization than that of the TI Dirac surface states. Models based on electrochemical potential have been presented to determine the sign of the spin voltage expected for the TI surface states. However, these models neglect critical experimental parameters which also affect the sign measured. Here we present a Mott two-spin current resistor model which takes into account these parameters such as spin-dependent interface resistances, and show that such inclusion can lead to a crossing of the voltage potential profiles for the spin-up and spin-down electrons within the channel, which can lead to measured spin voltages of either sign. These findings offer a resolution of the ongoing controversy regarding opposite signs of spin signal reported in the literature, and highlight the importance of including realistic experimental parameters inmore » the model.« less

Authors:
; ; ORCiD logo; ;
Publication Date:
Research Org.:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1619512
Alternate Identifier(s):
OSTI ID: 1612723
Grant/Contract Number:  
SC0017632
Resource Type:
Published Article
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Name: Scientific Reports Journal Volume: 9 Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Science & Technology - Other Topics; Spintronics

Citation Formats

Li, C. H., van ‘t Erve, O. M. J., Yan, C., Li, L., and Jonker, B. T. Electrical detection of current generated spin in topological insulator surface states: Role of interface resistance. United Kingdom: N. p., 2019. Web. doi:10.1038/s41598-019-43302-7.
Li, C. H., van ‘t Erve, O. M. J., Yan, C., Li, L., & Jonker, B. T. Electrical detection of current generated spin in topological insulator surface states: Role of interface resistance. United Kingdom. https://doi.org/10.1038/s41598-019-43302-7
Li, C. H., van ‘t Erve, O. M. J., Yan, C., Li, L., and Jonker, B. T. Mon . "Electrical detection of current generated spin in topological insulator surface states: Role of interface resistance". United Kingdom. https://doi.org/10.1038/s41598-019-43302-7.
@article{osti_1619512,
title = {Electrical detection of current generated spin in topological insulator surface states: Role of interface resistance},
author = {Li, C. H. and van ‘t Erve, O. M. J. and Yan, C. and Li, L. and Jonker, B. T.},
abstractNote = {Current generated spin polarization in topological insulator (TI) surface states due to spin-momentum locking has been detected recently using ferromagnet/tunnel barrier contacts, where the projection of the TI spin onto the magnetization of the ferromagnet is measured as a voltage. However, opposing signs of the spin voltage have been reported, which had been tentatively attributed to the coexistence of trivial two-dimensional electron gas states on the TI surface which may exhibit opposite current-induced polarization than that of the TI Dirac surface states. Models based on electrochemical potential have been presented to determine the sign of the spin voltage expected for the TI surface states. However, these models neglect critical experimental parameters which also affect the sign measured. Here we present a Mott two-spin current resistor model which takes into account these parameters such as spin-dependent interface resistances, and show that such inclusion can lead to a crossing of the voltage potential profiles for the spin-up and spin-down electrons within the channel, which can lead to measured spin voltages of either sign. These findings offer a resolution of the ongoing controversy regarding opposite signs of spin signal reported in the literature, and highlight the importance of including realistic experimental parameters in the model.},
doi = {10.1038/s41598-019-43302-7},
journal = {Scientific Reports},
number = 1,
volume = 9,
place = {United Kingdom},
year = {Mon May 06 00:00:00 EDT 2019},
month = {Mon May 06 00:00:00 EDT 2019}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1038/s41598-019-43302-7

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Cited by: 4 works
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