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Top: high-resolution ARPES data for various photon energies around the TP (with corresponding reduced kz values with respect to Γ). Bottom: corresponding curvature maps showing the TP formation at 30.5 eV photon energy inside the orange frame. The arrows indicate surface states SS2, SR, and B.

New paper has been published in Physical Review Letters

In this paper, co-authored by Valentyn Volobuev, MagTop member, the authors study the triple-point fermions in ferroelectric GeTe by using spin- and angle-resolved photoemission spectroscopy combined with ab initio density functional theory.

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