Neil Wilson’s research interests are in the correlation of atomic and mesoscale structure with physical properties in nanomaterials. His background is in microscopy and nanomaterial growth and characterisation. But his recent work has focused on the application of spatially-resolved angle-resolved photoemission spectroscopy (micro- and nano-ARPES) to probe electronic structure in 2D materials and 2D heterostructures, including the development of ARPES with in situ electrostatic gating to study field and carrier dependent effects. He is a professor in condensed matter Physics at the University of Warwick, based in the microscopy group.
Metal-mediated exfoliation of 2D materials (2DMs); probing interactions at the Au-2DM interface
Metal-mediated exfoliation can give macroscopic (millimetre or more) monolayers of a wide range of 2D materials (2DMs). This is both a useful tool for fabrication, and an interesting opportunity for studying the intricacies of interactions at the interfaces between three-dimensional metals and 2D materials. Understanding these interactions is essential for the integration of 2DM into (opto)electronic circuits as well as for unravelling the mechanism for metal-mediated exfoliation. Here, I will present some of our recent results using template-stripped gold for metal-mediated exfoliation of 2DMs, concentrating on prototypical examples of a 2D semiconductor (WSe2) and a 2D magnet (CrSBr). The large monolayer / few-layer flakes on ultra-flat gold that result from metal mediated exfoliation are ideally suited to study by surface science techniques. We gain insight into the Au-2DM interface through spatially resolved photoemission spectroscopy, at the I05 beamline of Diamond Light Source, both of core levels and angle-resolved of the valence bands. Contrasting results are observed for the two material systems, but both reveal the importance of charge transfer and hybridisation, consistent with covalent like quasi-bonding at the Au-2DM interface.
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