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Transverse magnetic focussing is the solid state equivalent of a massspectrometer. It is unique among 2D measurement techniques as it is able tomeasure a well defined section of the Fermi surface, making it possible todetect changes that would be averaged out over the whole Fermi surface. Here,we utilise this unique property to probe non-adiabatic spin dynamics and spindependent scattering of holes. We combine spin-resolved magnetic focussing withan additional independent in-plane magnetic field and observe a change infocussing peak amplitude that is not symmetric with respect to the fielddirection (i.e. $+B_{\parallel} \neq -B_{\parallel}$), and is extremelysensitive to the magnitude of the in-plane magnetic field. We show that themagnetic focussing signal is extremely sensitive to small changes in the Fermivelocity, which can be used to detect small shifts in the Fermi surface causedby an in-plane magnetic field. We also find that focussing can be used todetect the proximity between spin-split Fermi surfaces, which causenon-adiabatic spin dynamics.

Probing Fermi surface shifts with spin resolved transverse magnetic focussing