Spin-dependent electronic tunneling at zero magnetic field

The spin-dependent tunneling phenomenon in symmetric and asymmetric semiconductor heterostructures at zero magnetic field is studied theoretically on the base of a single conduction band and spin-dependent boundary conditions approach. It is shown that the spin-orbit splitting in the dispersion relation for the electrons in $A_{\mathrm{III}}{B}_{\mathrm{V}}$ semiconductor quantum-tunneling structures can provide a dependence of the tunneling transmission probability on the electron’s spin polarization. The dependence is calculated and discussed for different kinds of tunnel heterostructures.