Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Focus: Molecularly Functionalized Low-Dimensional Systems II - organized by Antonio Setaro, Carola Meyer, Aravind Vijayaraghvan and Matteo Mannini

CPP 12.3: Talk

Monday, March 12, 2018, 15:45–16:00, C 130

Spin-Dependent Electron Transmission Model for Chiral Molecules in Solid-State Nanodevices — •Xu Yang — Zernike Institute for Advanced Materials, University of Groningen, Groningen, the Netherlands

Various experiments have indicated that electron-transfer in several chiral molecules is spin-dependent, a phenomenon known as the Chiral Induced Spin Selectivity effect. This holds promise for realizing spintronic nanodevices that do not contain ferromagnetic materials. However, due to the lack of theoretical understanding, it is not always clear to what extent the chiral molecules contribute to the spin-dependent signals. We aim to develop a spin-dependent electron transmission model that can quantitatively evaluate the role of chiral molecules in two-terminal, three-terminal and four-terminal transport measurements. As starting point, we use the universal symmetry of electrical conduction to explain the necessity of spin-flip electron reflection at chiral molecules. Based on this model, we propose new types of graphene- or carbon nanotube- based multi-terminal transport measurements that can separate the CISS effect from other spin-dependent signals. Our modeling provides a fundamental insight and an effective toolbox for understanding low-dimensional solid-state spintronic devices functionalized with chiral molecules.