Static and dynamical properties of spin-polarons in La-doped CaMnO3

• The static and dynamic properties of spin-polarons in La-doped CaMnO3 are explored theoretically,by means of an eective low energy Hamiltonian. All parameters from the Hamiltoniainare evaluated from rst principles theory, without adjustable parameters. We compare dierentgeometries, like spin-polarons in bulk, surface and as single two-dimensional layers. The low energyHamiltonian is used to investigate the temperature stability of the spin-polaron, as well as theresponse to an external applied electric eld. Technically this involves atomistic spin-dynamics simulationsin combination with kinetic Monte Carlo simulations. Where a comparison can be made,our simulations exhibit an excellent agreement with available experimental data and previous theory.Remarkably, we nd that excellent control of the mobility of spin-polarons in this material canbe achieved, and that the critical parameters deciding this is the temperature and strength of theapplied electrical eld. We outline dierent technological implications of our ndings.

Nyckelord

Physics with spec. in Atomic, Molecular and Condensed Matter Physics

Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik

Publikations- och innehållstyp

vet (ämneskategori)

ovr (ämneskategori)