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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.
Project Summary: 2D MoS2 is well known for its ultralow friction and high wear resistance in vacuum or dry conditions, whereas it exhibits poor oxidation resistance at elevated temperatures or in humid air. The problems can be effectively resolved through adding compositing agents, such as Ti, Au, Sb2O3, etc.
Project Summary: 2D materials have intriguing quantum phenomena that are distinctively different from their bulk counterparts. Recently, epitaxially synthesized wafer-scale 2D metals, composed of elemental atoms, are attracting attention not only for their potential applications but also for exotic quantum effects such as superconductivity.
Project Summary: Graphene is an attractive material for all-optical modulation because of its ultrafast optical response and broad spectral coverage. However, all-optical graphene modulators reported so far require high pump fluence due to the ultrashort photo-carrier lifetime and limited absorption in graphene.
Project Summary: Angle-resolved photoemission spectroscopy (ARPES) has been established as a powerful tool to directly reveal electronic band structures of materials and played a critical role in discovering various topological materials such as topological insulators, Dirac semimetals, and Weyl semimetals. Investigations on quantum materials often require the combination of different modalities in photoemission spectroscopy.
Project Summary: Two-dimensional semiconductors have recently emerged as a host material for quantum emitters of single photons. While several reports on defect- and strain-induced single photon emission from 2D chalcogenides exist, a bottom-up, lithography-free approach to producing a high density of emitters has remained elusive.