Journal Article

PUBDB-2025-00724

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Imaging Orbital Vortex Lines in Three-Dimensional Momentum Space

Figgemeier, T.Extern* ; Uenzelmann, M. (Corresponding author)Extern* ; Eck, P.Extern* ; Schusser, J.Extern* ; Crippa, G.Extern* ; Neu, J. N. ; Geldiyev, B.Extern* ; Kagerer, P.Extern* ; Buck, J.Extern* ; Kalläne, M.Extern* ; Hoesch, M.DESY* ; Rossnagel, K.DESY* ; Siegrist, T.Extern* ; Lim, L.-K.Extern* ; Moessner, R.Extern* ; Sangiovanni, G. ; Di Sante, D. ; Reinert, F.Extern* ; Bentmann, H.Extern*

2025
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevX.15.011032  doi:10.3204/PUBDB-2025-00724

Report No.: arXiv:2402.10031

Abstract: 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. We determine the core of the orbital angular momentum vortex to host an almost movable, twofold, spin-degenerate Weyl nodal line, a topological feature predicted to occur in certain nonsymmorphic crystals. These results establish bimodal dichroism in SX-ARPES as a robust approach to trace 3D orbital textures. Our findings constitute the first imaging of nontrivial quantum-phase winding at line nodes and may pave the way to new orbitronic phenomena in quantum materials.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-S (FS-PETRA-S)
3. FS-SXQM (FS-SXQM)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. DFG project G:(GEPRIS)390858490 - EXC 2147: Komplexität und Topologie in Quantenmaterialien (CT.QMAT) (390858490) (390858490)
4. DFG project G:(GEPRIS)258499086 - SFB 1170: Topologische und korrelierte Elektronik in Ober- und Grenzflächen ("ToCoTronics") (258499086) (258499086)
5. BITMAP - aB-IniTio calculations and MAchine learning for suPerconducting collective phenomena in novel materials (897276) (897276)

Experiment(s):

1. PETRA Beamline P04 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Figgemeier, T. (Corresponding author)Extern* ; Ünzelmann, M. ; Eck, P. ; Schusser, J. ; Crippa, L. ; Neu, J. N. ; Geldiyev, B. ; Kagerer, P. ; Buck, J. ; Kalläne, M. ; Hoesch, M.DESY* ; Rossnagel, K.DESY* ; Siegrist, T. ; Lim, L. -. ; Moessner, R. ; Sangiovanni, G. ; Di Sante, D. ; Reinert, F. ; Bentmann, H.
Tomographic Imaging of Orbital Vortex Lines in Three-Dimensional Momentum Space
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