Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 110: Surface Magnetism

O 110.1: Vortrag

Freitag, 22. März 2024, 10:30–10:45, MA 144

Artificially-constructed chains of magnetic adatoms on superconducting β-Bi2Pd — •Jinkyung Kim^1,2, Mireia Tena^3,4, Kyungju Noh^1,2, Piotr Kot¹, Yujeong Bae^1,2, Andreas Heinrich^1,2, Nicolas Lorente^3,4, and Deung-Jang Choi^3,4 — ¹Center for Quantum Nanoscience (QNS), Institute for Basic Science, South Korea — ²Department of Physics, Ewha Womans University, Seoul 03760, South Korea — ³Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), 20018 Donostia-San Sebastián, Spain — ⁴Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain

Majorana bound state (MBS) has been studied in various condensed matter systems, such as one-dimensional topological superconductor, to realize topological quantum computation. Cr spin chains on superconducting β-Bi2Pd were suggested as one of the candidates of 1D topological superconductor, due to its combination of large magnetic moments and Rashba spin-orbit couplings of the superconducting substrate as shown in the simulation [1]. Taken advantage of atomic manipulation in STM, we artificially constructed a ferromagnetic Cr chain on a β-Bi2Pd surface. An evolution of in-gap states was carefully traced as we increase the length of the chain by attaching atoms one-by-one, and the results show excellent agreements with the simulations. We further investigate into topological phases of Cr chains based on the experimental discoveries, hinted as a formation of MBS at the edges of the chain. [1] Cristina Mier, et al., Physical Review B 104, 045406 (2021)

Keywords: Superconductivity; Majorana bound state; Magnetic chains; One-dimensional topological superconductor