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• W2950264562 abstract "The two classes of 3D, time-reversal-invariant insulators are known to subdivide into four classes in the presence of glide symmetry. Here, we extend this classification of insulators to include glide-symmetric Weyl metals, and find a finer $Z_4oplus Z$ classification. We further elucidate the smoking-gun experimental signature of each class in the photoemission spectroscopy of surface states. Measuring the $Z_4$ topological invariant by photoemission relies on identifying the glide representation of the initial Bloch state before photo-excitation - we show how this is accomplished with relativistic selection rules, combined with standard spectroscopic techniques to resolve both momentum and spin. Our method relies on a novel spin-momentum locking that is characteristic of all glide-symmetric solids (inclusive of insulators and metals in trivial and topological categories). As an orthogonal application, given a glide-symmetric solid with an ideally symmetric surface, we may utilize this spin-momentum locking to generate a source of FULLY spin-polarized photoelectrons, which have diverse applications in solid-state spectroscopy. Our ab-initio calculations predict Ba$_2$Pb, stressed Na$_3$Bi, and KHgSb to realize all three, nontrivial insulating phases in the $Z_4$ classification." @default.
• W2950264562 created "2019-06-27" @default.
• W2950264562 creator A5001814755 @default.
• W2950264562 creator A5003385467 @default.
• W2950264562 creator A5024948946 @default.
• W2950264562 creator A5072068901 @default.
• W2950264562 date "2020-06-29" @default.
• W2950264562 modified "2023-10-10" @default.
• W2950264562 title "Glide-resolved photoemission spectroscopy: Measuring topological invariants in nonsymmorphic space groups" @default.
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