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The exploration of emergent quantum phenomena under extreme conditions - such as ultra-high pressure, low temperature, and intense electromagnetic fields - offers a powerful pathway to discovering new states of matter and exotic electronic properties. In this presentation, I will introduce our recent efforts to design and probe quantum materials using focused ion beam (FIB)-fabricated microdevices as a versatile experimental platform.

By integrating FIB techniques with diamond anvil cells (DACs), we have realized high-precision transport measurements up to 50 GPa, revealing pressure- induced quantum phase transitions of chiral and topological spin textures, as well as the emergence of novel correlated electronic states [1].

Furthermore, by leveraging advanced FIB microstructuring, we are extending this approach to topological semimetals, particularly magnetic Weyl semimetals. I will highlight our recent progress on Li intercalation and the resulting gigantic carrier-density control [2], current-induced magnetization dynamics and emergent electromagnetic induction [3], and switchable nonreciprocity in nanosculpted three-dimensional helices [4]. These results showcase the unique interplay between topology and transport that cannot be accessed in as-grown crystals. Together, these studies demonstrate how microdevice-based extreme-environment experiments can open new frontiers in controlling and understanding strongly correlated and topological quantum phases.

References:
[1] Yukako Fujishiro et al., Phys. Rev. B 110, L220401 (2024) [Editors’ Suggestions]
[2] H. Matsuoka*, Yukako Fujishiro* et al., Phys. Rev. Mater. 9, 064406 (2025) (*equal contributions)
[3] Yukako Fujishiro et al., in preparation
[4] M. T. Birch, Yukako Fujishiro et al., arXiv:2506.17023

 The lecture will be on-site in room 203. ZOOM transmission will be available too.

Zoom information.