Stefan Meister (Cui Group) will be presenting his latest research in the field of Nanoelectronics at 12pm in McCullough 115.
Pizza will be served.
Title: Aharonov-Bohm Interference in Topological Insulator Nanoribbons
Abstract: Topological insulators are a new type of materials that are insulating in the bulk and conductive on the surface. They have attracted much attention because the surface electrons exhibit dissipationless and spin-polarized current without a need for strong magnetic fields. These exceptional properties make topological insulators a potential candidate for future electronics and spintronics applications. Since topological insulators have only recently been discovered, there are many open questions and a strong need for synthesis and study of these materials in a research environment. In this talk I will give a brief introduction to topological insulators, and discuss our synthesis of bismuth selenide (Bi2Se3) nanoribbons via the vapor-liquid-solid growth mechanism. When a strong magnetic field is applied parallel to the flow of electric current, these nanoribbons show pronounced Aharonov-Bohm oscillations in their magnetoresistance. The oscillations indicate that the entire surface is covered in 2-dimensional electrons, as expected based on the topological nature of the surface states. Our results suggest that topological insulator nanoribbons are an ideal material for the further study of this exciting new field and for the eventual realization of novel spintronics devices.
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