Dresden 2026 – scientific programme

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DS: Fachverband Dünne Schichten

DS 18: Spins in Molecular Systems

DS 18.2: Talk

Thursday, March 12, 2026, 15:15–15:30, REC/C213

Understanding interface-controlled CISS-MR (magnetoresistance) via electric dipole inversion using ambient STM — •T. N. Ha Nguyen¹, Lech Tomasz Baczewski², Aleksandr Kazimir³, Christina Lamers³, and Christoph Tegenkamp¹ — ¹Analysis of Solid Surfaces, Nanostructures and Quantum Materials, Technische Universität Chemnitz, Germany — ²Reichenhainerstr., 70 — ³Institute for Drug Discovery, Medical Faculty University of Leipzig, Leipzig, Germany

Recent studies have highlighted the significant influence of electric dipole moment orientation in chiral molecules on spin polarization. When chiral molecules with strong dipole moments adsorb onto a surface, their orientation breaks the interfacial symmetry, leading to enhanced spin-polarized currents. Using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS), we measured spin-polarized electron transport through polyalanine molecules, which possess substantial dipole moments. Notably, inverting the dipole moment while maintaining the molecule*s chirality results in a reversal of the chiral-induced spin selectivity magnetoresistance (CISS-MR). Our findings not only highlight the crucial role of electric dipole moments in chiral molecules but also provide insights into the CISS mechanism, particularly regarding the interface effect.

Keywords: CISS MR; dipole moment; chiral; interface; ambient STM