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Project Summary: Common metals bounce incident light in the infrared range. In our recent experiments, we discovered that a special class of metals, so called nodal metals hosting the two-dimensional electronic structure with van Hove singularities, support waveguiding of infrared energy in their bulk. This novel plasmonic effects is observed over an extended frequency range in near infrared.
Project Summary: The ability to engineer potential profiles of multilayered materials is critical for designing high-performance tunneling devices such as ferroelectric tunnel junctions (FTJs). FTJs promise electrically switchable memories, sensors, and logic devices. However, traditional FTJs comprising metal/oxide heterostructures only exhibit modest tunneling electroresistance (TER; usually <106), which is limited by defect states and interface trap states. In this work, the group led by Prof.
Project Summary: The emergence of magnetism via a magnetic proximity effect (MPE) allows the realization of magnetic properties in non-magnetic materials, leading to properties not observed in the bulk nor achievable via magnetic doping. MPEs are of particularly significant interest in heterostructures that interface a topological insulator with a ferromagnet.
Project Summary: In-situ spectroscopic ellipsometry (SE) presents a powerful tool to access precise measurements of film thickness, stoichiometry, and growth temperature at once in-operando in a non-destructive way.
Project Summary: The van der Waals (vdW) layered chalcogenides have attracted significant interest for photonic and optoelectronic applications due to their strongly anisotropic properties.
Project Summary: Confined transport of energy carriers in low-dimensional materials could induce unusual phenomena, leading to properties promising for various applications.
Project Summary: The ability to create atomistic defects in 2D transition metal dichalcogenide (TMD) films is of significant interest as an approach to tune optical and transport properties. Previous studies of ion irradiation show great potential when applied to 2D materials but have been limited to micron size exfoliated flakes or smaller.
Project Summary: Tailoring magnetic orders in topological insulators is critical to the realization of topological quantum phenomena. An outstanding challenge is to find a material where atomic defects lead to tunable magnetic orders while maintaining a nontrivial topology.
Project Summary: The elucidation of nucleation density, morphology, size and orientation of films deposited on a preferred substrate are challenging and critical to the crystallinity of materials.
Project Summary: The integration of magnetism and nontrivial band topology in magnetic topological insulators (MTIs) provides an ideal ground for identifying exotic states, such as the quantum anomalous Hall insulator and axion insulator.