TRR 360 Seminar:

Emergent phenomena in nanosculpted quantum material devices

Maximilian Birch

Dr. Maximilian Birch

RIKEN Center for Emergent Matter Science, Japan

Focused ion beam (FIB) techniques enable precisely tailored nanoscale devices to be fabricated directly from high-quality single crystals, providing a powerful platform for exploring emergent transport phenomena and unconventional experimental geometries. In this talk, I will discuss the development and application of FIB-based device fabrication approaches used to investigate a range of quantum materials and functionalities, including skyrmion dynamics, p-wave magnetism, and time-reversal symmetry breaking antiferromagnets. I will then present our recent development of three-dimensional nanosculpted FIB devices, focusing on helical structures fabricated from the high-mobility Weyl ferromagnet Co₃Sn₂S₂. By introducing inversion symmetry breaking on the length scale of the electron mean free path, these structures exhibit large nonreciprocal transport effects, resulting in a switchable zero-field diode response. More broadly, these results demonstrate how nanoscale geometric design can be used to access emergent electronic functionality in quantum materials.