Nonadiabatic Berry phase in nanocrystalline magnets

Nonadiabatic Berry phase in nanocrystalline magnets

Blog Article

It is investigated how a Berry phase is created in polycrystalline nanomagnets and how RELAX TEA 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 does.As an Jumpsuits explicit example, we consider a wire with a modulated cone angle.