Probing spin chirality of photoexcited topological insulators with circular dichroism: multi-dimensional time-resolved ARPES on Bi2Te2Se and Bi2Se3

J. Zhang; J. Caillaux; Z. Chen; M. Konczykowski; A. Hruban; A. Wołoś; A. Materna; L. Perfetti; E. Papalazarou; M. Marsi

doi:10.1016/j.elspec.2021.147125

Probing spin chirality of photoexcited topological insulators with circular dichroism: multi-dimensional time-resolved ARPES on Bi₂Te₂Se and Bi₂Se₃

J. Zhang, J. Caillaux, Z. Chen, M. Konczykowski, A. Hruban, A. Wołoś, A. Materna, L. Perfetti, E. Papalazarou, M. Marsi

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

Abstract

Using time-resolved multi-dimensional angle-resolved photoelectron spectroscopy (ARPES) we explore the angular momentum transfer of low energy polarized photons to two prototype topological insulators, Bi₂Te₂Se and Bi₂Se₃. Our comparative study is based on the analysis of circular dichroism in the photoemission yield of photoexcited Dirac states, and reveals that the spin vector of in-gap Dirac electrons in Bi₂Te₂Se presents a more pronounced out-of-plane component compared to that of Bi₂Se₃. We show that the multi-dimensional ARPES approach can be effectively used to observe the spin texture of photoexcited topological insulators, and to unambiguously disentangle experimental geometry and matrix element effects.

Original language	English
Article number	147125
Journal	Journal of Electron Spectroscopy and Related Phenomena
Volume	253
DOIs	https://doi.org/10.1016/j.elspec.2021.147125
Publication status	Published - 1 Dec 2021
Externally published	Yes

Keywords

Circular dichroism
Dirac fermion chirality
Out-of-equilibrium topological states
Spin texture
Surface states
Topological insulators

Access to Document

10.1016/j.elspec.2021.147125

Cite this

Zhang, J., Caillaux, J., Chen, Z., Konczykowski, M., Hruban, A., Wołoś, A., Materna, A., Perfetti, L., Papalazarou, E., & Marsi, M. (2021). Probing spin chirality of photoexcited topological insulators with circular dichroism: multi-dimensional time-resolved ARPES on Bi₂Te₂Se and Bi₂Se₃. Journal of Electron Spectroscopy and Related Phenomena, 253, Article 147125. https://doi.org/10.1016/j.elspec.2021.147125

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title = "Probing spin chirality of photoexcited topological insulators with circular dichroism: multi-dimensional time-resolved ARPES on Bi2Te2Se and Bi2Se3",

abstract = "Using time-resolved multi-dimensional angle-resolved photoelectron spectroscopy (ARPES) we explore the angular momentum transfer of low energy polarized photons to two prototype topological insulators, Bi2Te2Se and Bi2Se3. Our comparative study is based on the analysis of circular dichroism in the photoemission yield of photoexcited Dirac states, and reveals that the spin vector of in-gap Dirac electrons in Bi2Te2Se presents a more pronounced out-of-plane component compared to that of Bi2Se3. We show that the multi-dimensional ARPES approach can be effectively used to observe the spin texture of photoexcited topological insulators, and to unambiguously disentangle experimental geometry and matrix element effects.",

keywords = "Circular dichroism, Dirac fermion chirality, Out-of-equilibrium topological states, Spin texture, Surface states, Topological insulators",

author = "J. Zhang and J. Caillaux and Z. Chen and M. Konczykowski and A. Hruban and A. Wo{\l}o{\'s} and A. Materna and L. Perfetti and E. Papalazarou and M. Marsi",

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year = "2021",

month = dec,

day = "1",

doi = "10.1016/j.elspec.2021.147125",

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Zhang, J, Caillaux, J, Chen, Z, Konczykowski, M, Hruban, A, Wołoś, A, Materna, A, Perfetti, L, Papalazarou, E & Marsi, M 2021, 'Probing spin chirality of photoexcited topological insulators with circular dichroism: multi-dimensional time-resolved ARPES on Bi₂Te₂Se and Bi₂Se₃', Journal of Electron Spectroscopy and Related Phenomena, vol. 253, 147125. https://doi.org/10.1016/j.elspec.2021.147125

TY - JOUR

T1 - Probing spin chirality of photoexcited topological insulators with circular dichroism

T2 - multi-dimensional time-resolved ARPES on Bi2Te2Se and Bi2Se3

AU - Zhang, J.

AU - Caillaux, J.

AU - Chen, Z.

AU - Konczykowski, M.

AU - Hruban, A.

AU - Wołoś, A.

AU - Materna, A.

AU - Perfetti, L.

AU - Papalazarou, E.

AU - Marsi, M.

PY - 2021/12/1

Y1 - 2021/12/1

N2 - Using time-resolved multi-dimensional angle-resolved photoelectron spectroscopy (ARPES) we explore the angular momentum transfer of low energy polarized photons to two prototype topological insulators, Bi2Te2Se and Bi2Se3. Our comparative study is based on the analysis of circular dichroism in the photoemission yield of photoexcited Dirac states, and reveals that the spin vector of in-gap Dirac electrons in Bi2Te2Se presents a more pronounced out-of-plane component compared to that of Bi2Se3. We show that the multi-dimensional ARPES approach can be effectively used to observe the spin texture of photoexcited topological insulators, and to unambiguously disentangle experimental geometry and matrix element effects.

AB - Using time-resolved multi-dimensional angle-resolved photoelectron spectroscopy (ARPES) we explore the angular momentum transfer of low energy polarized photons to two prototype topological insulators, Bi2Te2Se and Bi2Se3. Our comparative study is based on the analysis of circular dichroism in the photoemission yield of photoexcited Dirac states, and reveals that the spin vector of in-gap Dirac electrons in Bi2Te2Se presents a more pronounced out-of-plane component compared to that of Bi2Se3. We show that the multi-dimensional ARPES approach can be effectively used to observe the spin texture of photoexcited topological insulators, and to unambiguously disentangle experimental geometry and matrix element effects.

KW - Circular dichroism

KW - Dirac fermion chirality

KW - Out-of-equilibrium topological states

KW - Spin texture

KW - Surface states

KW - Topological insulators

U2 - 10.1016/j.elspec.2021.147125

DO - 10.1016/j.elspec.2021.147125

M3 - Article

AN - SCOPUS:85116815219

SN - 0368-2048

VL - 253

JO - Journal of Electron Spectroscopy and Related Phenomena

JF - Journal of Electron Spectroscopy and Related Phenomena

M1 - 147125