Localized magnetic states in Rashba dots

Instituto de F´isica Interdisciplinar y Sistemas Complejos (CSIC-UIB), E-07122 Palma de Mallorca, Spain(Dated: February 16, 2009)We study the formation of local moments in quantum dots arising in quasi-one dimensional elec-tron wires due to localized spin-orbit (Rashba) interaction. Using an Anderson-like model to describethe occurrence of the magnetic moments in these Rashba dots, we calculate the local magnetizationwithin the mean-field approximation. We find that the magnetization becomes a nontrivial func-tion of the Rashba coupling strength. We discuss both the equilibrium and nonequilibrium cases.Interestingly, we obtain a magnetic phase which is stable at large bias due to the Rashba interaction.