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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.
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.