Ultrafast Spin-Charge Conversion at SnBi2Te4/Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy

E. Rongione; S. Fragkos; L. Baringthon; J. Hawecker; E. Xenogiannopoulou; P. Tsipas; C. Song; M. Mičica; J. Mangeney; J. Tignon; T. Boulier; N. Reyren; R. Lebrun; J. M. George; P. Le Fèvre; S. Dhillon; A. Dimoulas; H. Jaffrès

doi:10.1002/adom.202102061

Ultrafast Spin-Charge Conversion at SnBi₂Te₄/Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy

E. Rongione, S. Fragkos, L. Baringthon, J. Hawecker, E. Xenogiannopoulou, P. Tsipas, C. Song, M. Mičica, J. Mangeney, J. Tignon, T. Boulier, N. Reyren, R. Lebrun, J. M. George, P. Le Fèvre, S. Dhillon, A. Dimoulas, H. Jaffrès

Research output: Contribution to journal › Article › peer-review

Abstract

Spin-to-charge conversion (SCC) involving topological surface states (TSS) is one of the most promising routes for highly efficient spintronic devices for terahertz (THz) emission. Here, the THz generation generally occurs mainly via SCC consisting in efficient dynamical spin injection into spin-locked TSS. In this work, sizable THz emission from a nanometric thick topological insulator (TI)/ferromagnetic junction—SnBi₂Te₄/Co—specifically designed to avoid bulk band crossing with the TSS at the Fermi level, unlike its parent material Bi₂Te₃ is demonstrated. THz emission time domain spectroscopy (TDS) is used to indicate the TSS contribution to the SCC by investigating the TI thickness and angular dependence of the THz emission. This work illustrates THz emission TDS as a powerful tool alongside angular resolved photoemission spectroscopy (ARPES) methods to investigate the interfacial spintronic properties of TI/ferromagnet bilayers.

Original language	English
Article number	2102061
Journal	Advanced Optical Materials
Volume	10
Issue number	7
DOIs	https://doi.org/10.1002/adom.202102061
Publication status	Published - 1 Apr 2022
Externally published	Yes

Keywords

spin-charge conversion
terahertz spectroscopy
topological insulators
topological surface states
ultrafast spintronics

Access to Document

10.1002/adom.202102061

Cite this

Rongione, E., Fragkos, S., Baringthon, L., Hawecker, J., Xenogiannopoulou, E., Tsipas, P., Song, C., Mičica, M., Mangeney, J., Tignon, J., Boulier, T., Reyren, N., Lebrun, R., George, J. M., Le Fèvre, P., Dhillon, S., Dimoulas, A., & Jaffrès, H. (2022). Ultrafast Spin-Charge Conversion at SnBi₂Te₄/Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy. Advanced Optical Materials, 10(7), Article 2102061. https://doi.org/10.1002/adom.202102061

@article{e785b57595124978b227a8c08f0421bb,

title = "Ultrafast Spin-Charge Conversion at SnBi2Te4/Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy",

abstract = "Spin-to-charge conversion (SCC) involving topological surface states (TSS) is one of the most promising routes for highly efficient spintronic devices for terahertz (THz) emission. Here, the THz generation generally occurs mainly via SCC consisting in efficient dynamical spin injection into spin-locked TSS. In this work, sizable THz emission from a nanometric thick topological insulator (TI)/ferromagnetic junction—SnBi2Te4/Co—specifically designed to avoid bulk band crossing with the TSS at the Fermi level, unlike its parent material Bi2Te3 is demonstrated. THz emission time domain spectroscopy (TDS) is used to indicate the TSS contribution to the SCC by investigating the TI thickness and angular dependence of the THz emission. This work illustrates THz emission TDS as a powerful tool alongside angular resolved photoemission spectroscopy (ARPES) methods to investigate the interfacial spintronic properties of TI/ferromagnet bilayers.",

keywords = "spin-charge conversion, terahertz spectroscopy, topological insulators, topological surface states, ultrafast spintronics",

author = "E. Rongione and S. Fragkos and L. Baringthon and J. Hawecker and E. Xenogiannopoulou and P. Tsipas and C. Song and M. Mi{\v c}ica and J. Mangeney and J. Tignon and T. Boulier and N. Reyren and R. Lebrun and George, \{J. M.\} and \{Le F{\`e}vre\}, P. and S. Dhillon and A. Dimoulas and H. Jaffr{\`e}s",

note = "Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",

year = "2022",

month = apr,

day = "1",

doi = "10.1002/adom.202102061",

language = "English",

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Rongione, E, Fragkos, S, Baringthon, L, Hawecker, J, Xenogiannopoulou, E, Tsipas, P, Song, C, Mičica, M, Mangeney, J, Tignon, J, Boulier, T, Reyren, N, Lebrun, R, George, JM, Le Fèvre, P, Dhillon, S, Dimoulas, A & Jaffrès, H 2022, 'Ultrafast Spin-Charge Conversion at SnBi₂Te₄/Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy', Advanced Optical Materials, vol. 10, no. 7, 2102061. https://doi.org/10.1002/adom.202102061

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T1 - Ultrafast Spin-Charge Conversion at SnBi2Te4/Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy

AU - Rongione, E.

AU - Fragkos, S.

AU - Baringthon, L.

AU - Hawecker, J.

AU - Xenogiannopoulou, E.

AU - Tsipas, P.

AU - Song, C.

AU - Mičica, M.

AU - Mangeney, J.

AU - Tignon, J.

AU - Boulier, T.

AU - Reyren, N.

AU - Lebrun, R.

AU - George, J. M.

AU - Le Fèvre, P.

AU - Dhillon, S.

AU - Dimoulas, A.

AU - Jaffrès, H.

PY - 2022/4/1

Y1 - 2022/4/1

N2 - Spin-to-charge conversion (SCC) involving topological surface states (TSS) is one of the most promising routes for highly efficient spintronic devices for terahertz (THz) emission. Here, the THz generation generally occurs mainly via SCC consisting in efficient dynamical spin injection into spin-locked TSS. In this work, sizable THz emission from a nanometric thick topological insulator (TI)/ferromagnetic junction—SnBi2Te4/Co—specifically designed to avoid bulk band crossing with the TSS at the Fermi level, unlike its parent material Bi2Te3 is demonstrated. THz emission time domain spectroscopy (TDS) is used to indicate the TSS contribution to the SCC by investigating the TI thickness and angular dependence of the THz emission. This work illustrates THz emission TDS as a powerful tool alongside angular resolved photoemission spectroscopy (ARPES) methods to investigate the interfacial spintronic properties of TI/ferromagnet bilayers.

AB - Spin-to-charge conversion (SCC) involving topological surface states (TSS) is one of the most promising routes for highly efficient spintronic devices for terahertz (THz) emission. Here, the THz generation generally occurs mainly via SCC consisting in efficient dynamical spin injection into spin-locked TSS. In this work, sizable THz emission from a nanometric thick topological insulator (TI)/ferromagnetic junction—SnBi2Te4/Co—specifically designed to avoid bulk band crossing with the TSS at the Fermi level, unlike its parent material Bi2Te3 is demonstrated. THz emission time domain spectroscopy (TDS) is used to indicate the TSS contribution to the SCC by investigating the TI thickness and angular dependence of the THz emission. This work illustrates THz emission TDS as a powerful tool alongside angular resolved photoemission spectroscopy (ARPES) methods to investigate the interfacial spintronic properties of TI/ferromagnet bilayers.

KW - spin-charge conversion

KW - terahertz spectroscopy

KW - topological insulators

KW - topological surface states

KW - ultrafast spintronics

U2 - 10.1002/adom.202102061

DO - 10.1002/adom.202102061

M3 - Article

AN - SCOPUS:85124526475

SN - 2195-1071

VL - 10

JO - Advanced Optical Materials

JF - Advanced Optical Materials

IS - 7

M1 - 2102061