Spinodal Superlattices of Topological Insulators

Usanmaz, Demet; Nath, Pinku; Toher, Cormac; Plata, Jose Javier; Friedrich, Rico; Fornari, Marco; Nardelli, Marco Buongiorno; Curtarolo, Stefano

doi:10.1021/acs.chemmater.7b05299

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Spinodal Superlattices of Topological Insulators

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Curtarolo, Stefano
Center for Materials Genomics, Duke University;
Theory, Fritz Haber Institute, Max Planck Society;
Materials Science, Electrical Engineering, Physics and Chemistry, Duke University;

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Citation

Usanmaz, D., Nath, P., Toher, C., Plata, J. J., Friedrich, R., Fornari, M., et al. (2018). Spinodal Superlattices of Topological Insulators. Chemistry of Materials, 30(7), 2331-2340. doi:10.1021/acs.chemmater.7b05299.

Cite as: https://hdl.handle.net/21.11116/0000-0001-508C-7

Abstract

Spinodal decomposition is proposed for stabilizing self-assembled interfaces between topological insulators (TIs) by combining layers of iso-structural and iso-valent TlBiX₂ (X = S, Se, Te) materials. The composition range for gapless states is addressed concurrently to the study of thermodynamically driven boundaries. By tailoring composition, the TlBiS₂–TlBiTe₂ system might produce both spinodal superlattices and two-dimensional eutectic microstructures, either concurrently or separately. The dimensions and topological nature of the metallic channels are determined by following the spatial distribution of the charge density and the spin-texture. The results validate the proof of concept for obtaining spontaneously forming two-dimensional TI-conducting channels embedded into three-dimensional insulating environments without any vacuum interfaces. Since spinodal decomposition is a controllable kinetic phenomenon, its leverage could become the long-sought enabler for effective TI technological deployment.