Low temperature nano-spin filtering using a diluted magnetic semiconductor core–shell quantum dot

The spin polarized electron transport properties and spin polarized tunneling current have been investigated analytically in a diluted magnetic semiconductor core–shell quantum dot in the presence of applied electric and magnetic fields. Assuming the electron wave function to satisfy WKB approximation, the electron energy eigenvalues have been calculated. The spin polarized tunneling current and the spin dependent tunneling coefficient are obtained by taking into account the exchange interaction and Zeeman splitting. Numerical estimates made for a specific diluted magnetic semiconductor, viz., Zn1 � xMnxSe=ZnS core–shell quantum dot establishes the possibility of a nano-spin filter for a particular biasing voltage and applied magnetic field.