Emergent phenomena in nanosculpted devices of quantum materials

Abstract: Focused ion beam (FIB) fabrication methods enable precise nanoscale devices to be fashioned from high-quality single crystalline materials, ideal for exploring magnetic textures and nonlinear transport phenomena. In this talk, I will detail and explain the methodology and rationale behind the various FIB device designs I have utilised to investigate emergent functionality in a wide range of quantum materials, including p-wave magnets, skyrmions and time-reversal symmetry breaking antiferromagnets. I will then highlight my development of the FIB fabrication of three dimensional single crystalline nanostructures, in the form of helical-shaped devices of the high-mobility Weyl magnet Co3Sn2S2. By breaking inversion symmetry on the length scale of the electron mean free path, we observe large nonreciprocal transport, resulting in a switchable diode effect.

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