Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster I

MA 15.6: Poster

Dienstag, 18. März 2025, 10:00–12:30, P1

Spin Textures and Surface State Sequences of a Prototypical Topological Insulator Revealed by Momentum Microscopy — •Wei-Sheng Chiu^1,2, Ina Marie Verzola³, Ying-Jiun Chen^1,4, Rovi Angelo Beloya Villaos³, Claus Michael Schneider^1,2, Feng-Chuan Chuang³, and Christian Tusche^1,2 — ¹Forschungszentrum Jülich, Peter Grünberg Institut PGI-6, 52425 Jülich, Germany — ²Fakultät für Physik, Universität Duisburg-Essen, 47057 Duisburg, Germany — ³National Sun Yat-sen University, Department of Physics, 80424 Kaohsiung, Taiwan — ⁴Forschungszentrum Jülich,Ernst Ruska-Centre ER-C-1, 52425 Jülich, Germany

As a hallmark of the prototypical topological insulator of Bi₂Se₃, its intriguing topological surface state (TSS) has been extensively studied. By using spin-resolving momentum microscopy (SPEMM) with an Au passivated Ir(100) imaging spin filter, we directly recorded the spin-resolved momentum maps (k_x,k_y) over entire surface Brillouin zone (SBZ) of Bi₂Se₃. In addition to the well-known Dirac cone at the Fermi level, our measurements reveal a sequence of several Dirac-like spin textures and crossings. Our first-principles calculations indicate that those overlooked bands are attributed to Bi₂Se₃ surface states spanning a wide binding energy up to 4 eV below the Fermi level.

Keywords: Spin-resolving momentum microscopy