Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 89: Spins on surfaces at the atomic scale II

O 89.12: Vortrag

Donnerstag, 12. März 2026, 17:45–18:00, WILL/A317

Current-induced Electron Spin Polarization in Magnetic Molecules — •Paul Greule, Wantong Huang, Máté Stark, Kwan Ho Au-Yeung, Johannes Schwenk, Christoph Sürgers, Wolfgang Wernsdorfer, and Philip Willke — Physikalisches Institut (PHI), Karlsruhe Institute of Technology, Karlsruhe, Germany

Electron spins of single molecules offer a promising platform for quantum information processing. To harness such spins as functional qubits, efficient initialization is essential. Electron spin resonance combined with scanning tunnelling microscopy (ESR-STM) has emerged as a powerful technique to probe molecular spins at the atomic scale. Using this technique, it has been shown that a spin-polarized tunnelling current can polarize the nuclear spin of a single Cu atom [1]. In this talk, we show that this concept can be transferred to the electron spin of molecules: Using Fe-FePc complexes with an electron spin of S=1/2 [2], we build molecular dimers. Here, the first complex serves as a readout and pumping system, while the energy-level occupation of the second complex is probed and manipulated. The exchange interaction between them enables remote spin-pumping, where angular momentum is transferred. Controlling the spin-polarized tunnel current via the bias voltage allows us to tune the spin polarization of the second complex remotely. Our findings establish an all-electrical technique to initialize molecular spin qubits and provide insights for enhanced control schemes. [1] K. Yang et al., Nat Nano 2018, 13, 1120-1125 [2] W. Huang et al., Nat Commun 2025, 16, 5208

Keywords: molecular spins; electron spin resonance; quantum manipulation; spin initialization; spin pumping