Probing Fermi surface parity with spin-resolved transverse magnetic focusing

Fermi surface measurements are critical for determining the electrical and magnetic properties of solids. Typical techniques used in 2D systems such as Shubnikov--de Haas and commensurability oscillations are unable to detect changes in the parity of the Fermi surface, i.e., when $E$(+$k$) $\ensuremath{\ne}$ $E$(-$k$). In this work, the authors show that transverse magnetic focusing can be used to detect changes in Fermi surface parity, as focusing only measures a well defined section of the Fermi surface.