LOW-DIMENSIONAL SOURCES OF SPIN-POLARIZED CHARGE CARRIERS

摘要

We propose two types of low-dimensional current sources supplying spin-polarized charge carriers. One of them is based on the magnetic subband depopulation effect in a quantum wire made of a semiconductor, placed in a magnetic field. The other one employs a quantum point contact in a diluted magnetic semiconductor. The quantum mechanical model describing transport of charge carriers in these structures was developed within Green's function formalism. Operation of the quantum wires and the quantum point contacts as sources of spin-polarized currents are discussed. They are predicted to provide 80-100 % of spin polarization in a single-mode regime.