Nonadiabatic Berry phase in nanocrystalline magnets

Nonadiabatic Berry phase in nanocrystalline magnets

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Liebherr IKBP2760 BioFresh Performance 140cm Built In Integrated Larder Fridge It is investigated how a Berry phase is created in polycrystalline nanomagnets and how the phase translates into an emergent magnetic field and into a topological Hall-effect contribution.The analysis starts directly from the spin of the conduction electrons and does not involve any adiabatic Hamiltonian.Completely random spin alignment in the nanocrystallites does not lead to a nonzero emergent field, but a modulation of the local magnetization Side Plate does.As an explicit example, we consider a wire with a modulated cone angle.