TY  - EJOUR
AU  - Figgemeier, T.
AU  - Ünzelmann, M.
AU  - Eck, P.
AU  - Schusser, J.
AU  - Crippa, L.
AU  - Neu, J. N.
AU  - Geldiyev, B.
AU  - Kagerer, P.
AU  - Buck, J.
AU  - Kalläne, M.
AU  - Hoesch, M.
AU  - Rossnagel, K.
AU  - Siegrist, T.
AU  - Lim, L. -K.
AU  - Moessner, R.
AU  - Sangiovanni, G.
AU  - Di Sante, D.
AU  - Reinert, F.
AU  - Bentmann, H.
TI  - Tomographic Imaging of Orbital Vortex Lines in Three-Dimensional Momentum Space
IS  - arXiv:2402.10031
M1  - PUBDB-2025-00813
M1  - arXiv:2402.10031
PY  - 2024
AB  - We report the experimental discovery of orbital vortex lines in the three-dimensional (3D) band structure of a topological semimetal. Combining linear and circular dichroism in soft x-ray angle-resolved photoemission (SX-ARPES) with first-principles theory, we image the winding of atomic orbital angular momentum, thereby revealing - and determining the location of - lines of vorticity in full 3D momentum space. Our observation of momentum-space vortex lines with quantized winding number establishes an analogue to real-space quantum vortices, for instance, in type-II superconductors and certain non-collinear magnets. These results establish multimodal dichroism in SX-ARPES as an approach to trace 3D orbital textures. Our present findings particularly constitute the first imaging of non-trivial quantum-phase winding at line nodes and may pave the way to new orbitronic phenomena in quantum materials
LB  - PUB:(DE-HGF)25
UR  - https://bib-pubdb1.desy.de/record/624344
ER  -