Oscillations of electric conductivity in the plane perpendicular to the magnetic field oscillates periodically as a function of magnetic field (and not the inverse of magnetic field as in the case of Shubnikov-de Haas oscillations) are called Sondheimer oscillations. According to our recent findings, they are not merely semiclassical. An empirical scaling for the amplitude of the oscillations across a forty-fold variation of thickness links their amplitude to the quantum of conductance, the magnetic length, and the geometry of the Fermi surface. Explaining this empirical expression is a challenge to theory. We aim to explore ballistic crystals in order to provide input for a quantum theory of Sondheimer oscillations. The crystals for this study will be tailored using Focused Ion Beam (FIB) technology in Philip Moll’s laboratory in Hamburg.