Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 57: Topology and Symmetry-protected Materials (joint session O/TT)
TT 57.2: Vortrag
Freitag, 21. März 2025, 10:45–11:00, H25
Hidden spin-texture in an inversion-symmetric Dirac crystal — Kenta Hagiwara1,2, Peter C. Schmitz1, Philipp Rüßmann1, Xin Liang Tan1,2, Ying-Jiun Chen3, Kui-Hon Ou Yang4, Raman Sankar5, Chien Jing4, Yi-Hsin Shen4, Mahmoud Zeer1, Dongwook Go6, Iulia Cojocariu1, Daniel Baranowski1, Vitaliy Feyer1, Minn-Tsong Lin1,6, Stefan Blügel1, Claus M. Schneider1,2, Yuriy Mokrousov1,5, and •Christian Tusche1,2 — 1Peter Grünberg Institut, Forschungszentrum Jülich, — 2Faculty of Physics, University of Duisburg-Essen — 3Ernst Ruska-Centre, Forschungszentrum Jülich — 4Department of Physics, National Taiwan University, Taipei, Taiwan — 5Academia Sinica, Taipei, Taiwan — 6Johannes-Gutenberg University Mainz
A hidden spin polarization refers to a local spin polarization caused by apparent symmetry breaking and offers new perspectives for spintronics applications. Transition metal dichalcogenides can host various topological phases depending on the symmetry of their crystal structure. Here, by means of spin-resolving momentum microscopy, we reveal the spin texture of both topologically and symmetrically distinct surface and bulk Dirac cones in the inversion symmetric Dirac semimetal NiTe2. We discovered a “hidden” spin polarization the bulk Dirac cone, localized at the different Te layers of the inversion symmetric bulk unit cell, such that the overlap of the two states results in a topologically trivial Dirac cone enforced by the global crystal symmetry. This work establishes a link between topology, spin-texture, and symmetry, enabling control by external perturbations.
Keywords: Dirac cone; Spin-texture; Topology; Symmetry; Momentum Microscopy