Quantum oscillations in focused ion beam prepared microstructures of ZrSiS

Strain-free microstructures allow for the observation of previously unseen finite size effects in quantum materials. Focused ion beam microstructuring techniques unlock new experimental capabilities, as the sample size is of order with the electronic mean free path revealing novel quantum coherent electronic orbits [1]. ZrSiS is a nodal-line semimetal with a large linear electronic dispersion near the Fermi level, making it an ideal platform to explore electronic behavior primarily governed by topology and correlation effects. Bulk ZrSiS has already proven to be an excellent probe into nodal-line semimetal physics, allowing for complete Fermi surface mapping in good agreement with density-functional-theory calculations [2]. Here we present a study of magneto-quantum oscillations in strain-free microstructures of ZrSiS as an investigation of finite size effects. The appearance of new oscillation frequencies not reported in bulk measurements requires interpretation beyond the conventional Lifshitz-Kosevich formalism.

[1] P.J.W. Moll et al. Nature 535, 266-270 (2016)

[2] C. Müller et al. Phys. Rev. Res., 2, 023217 (2020)