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Condensed Matter Physics Seminar

Condensed Matter Physics Seminar Online

On the origin of circular dichroism in angle resolved photoemission from graphene, WSe2, and other quantum materials

16-04-2024 14:00 - 15:00
Zoom seminar - Institute of Physics P.A.S.
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Łukasz Pluciński
Forschungszentrum Jülich GmbH, Jülich Germany

On the example of graphene, within the dipole approximation, we will discuss various contributions to circular dichroism in angle-resolved

photoemission (CD-ARPES) [1,2] which include phase shifts of the participating partial waves in the atomic photoionization [3],

the interatomic phase shifts [4], and the CD due to elastic scattering of an excited electron [5]. Using tabulated phase shifts and

radial integrals [6] we predict photon energies at which atomic CD signal might exhibit sign changes, while a more quantitative

calculations with and without multiple scattering are performed using the EDAC cluster code [7]. Subsequently, we perform similar

analysis for WSe2, a material where orbital characters are relatively well-defined, however, varying over Brillouin zone, with different

contributions at K, K', and Gamma points. Subsequently, we will proceed with the simple interatomic interference model that qualitatively

explains asymmetric spin-polarized ARPES (spin-ARPES) spin texture from WTe2 single crystal surface. If time allows, we will

in addition discuss preliminary experimental spin-ARPES results from PtTe2. The main objective of this study is to investigate

if and how CD-ARPES and spin-ARPES techniques can contribute to a better understanding of the topological properties exhibited

by novel quantum materials.


[1] L. Plucinski, arXiv:2309.02187 (2023)

[2] P. Krueger et al. JESRP 258, 147219 (2022)

[3] S. Moser, JESRP 214, 29 (2017)

[4] T. Heider, et al., Phys. Rev. Lett. 130, 146401 (2023)

[5] H. Daimon et al., Jpn. J. of Appl. Phys. 32, L1480 (1993)

[6] S. Goldberg et al., JESRP 21, 285 (1981)

[7] J. García de Abajo, M. van Hove, and C. S. Fadley, Phys. Rev. B 63, 75404 (2001)


List of Dates (Page event details)

  • 16-04-2024 14:00 - 15:00
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