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Explore electric-field control of zero-dimensional topologically protected end states in ultrathin germanene nanoribbons in this QuMat seminar by Pantelis Bampoulis from the University of Twente. Discover how ultrathin, zigzag-terminated germanene nanoribbons serve as a unified platform that hosts one-dimensional topological insulator phases with strong spin-orbit coupling while enabling reversible, electric-field control of their zero-dimensional end modes in a vertical tunnel-junction geometry at 77 K. Learn about the segregation-epitaxy method used to fabricate arrays of germanene nanoribbons with various widths and understand how topological edge states behave when nanoribbon width exceeds the critical ~2 nm threshold versus when it falls below this limit, leading to edge mode hybridization and the emergence of robust end states indicating a 1D topological insulator. Examine the atomic-scale, field-effect control of symmetry-protected 0D modes achieved through perpendicular electric field tuning in scanning tunneling microscopy junctions, demonstrating on/off switching capabilities that establish proof-of-principle for topological field-effect switches with potential applications in ultra-small memory devices, robust qubits, and neuromorphic components.
