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MA: Fachverband Magnetismus
MA 19: Surface Magnetism
MA 19.8: Vortrag
Dienstag, 19. März 2024, 11:30–11:45, EB 407
Bismuthene on a three-dimensional spin-structure realized in Mn/Ag(111) — •Gustav Bihlmayer1, Chia-Ju Chen2, Yen-Hui Lin2, Stefan Blügel1, and Pin-Jui Hsu2 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany — 2Department of Physics, National Tsing Hua University, Hsinchu, 30013, Taiwan
Depositing Mn on a BiAg2/Ag(111) surface alloy leads to the formation of a honeycomb (HC) lattice on the surface, that can be observed with scanning tunneling microscopy (STM). The HC lattice is commensurate with a p(2 × 2) Ag(111) unit cell and can be assigned to Bi atoms, as can be derived from comparison to density functional theory (DFT) calculations. Furthermore, in spin-polarized STM no spin-signal is visible from the HC, but islands with different spin-polarization patterns with p(2 × 2) periodicity are found. These patterns can be manipulated via an external magnetic field, substantiating their magnetic origin. They show similarities with a 3 Q structure, predicted for Mn/Cu(111) [1] and observed in Mn/Re(0001) [2]. The DFT calculations confirm the stability of the 3 Q state compared to other ground states found theoretically [3] and experimentally [4] for Mn/Ag(111). This system realizes a quantum-spin-Hall system in contact with a non-collinear three-dimensionally modulated spin structure.
[1] Ph. Kurz et al., Phys. Rev. Lett. 86, 1106 (2001). [2] J. Spethmann et al., Phys. Rev. Lett. 124 227203 (2020). [3] M. dos Santos Dias et al., Phys. Rev. B 83, 054435 (2011). [4] C. L. Gao et al., Phys. Rev. Lett. 101, 267205 (2008).
Keywords: non-collinear spin structure; bismuthene; scanning tunneling microscopy; density functional theory