Abstract
A spin filter based on an organic polymer coupled to a quantum wire is proposed. The spin polarization of the conductance is manipulated by the gate voltage but not by the external magnetic field as in previous spin filters. The results show that a class of organic polymers with spin-polarized flatband can be candidates of the device. The necessary conditions for the fully polarized conductance are discussed. As an application of the result, the device can be used to detect the magnetic transition in the polymer.
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