This project is within the field of semiconductor spintronics that promises realization of spin-based active components for electronic circuits. The objective of the present project, that will be a continuation of previous project supported by the Carl Trygger Foundation: CTS 21:1583: "Study of electronic focusing lens embedded in semiconductor nanodevices", is to investigate theoretically spin polarization and spin-dependent electron transport through two-dimensional region embedded in a wide quantum wire (QW) fabricated in GaAs/AlGaAs heterostructure. The experimental setup consists of three quantum point contacts (QPCs), with two of them functioning as spin injectors and the third acting as a spin detector. The main aim of this research is to study the possibility of implementing electron focusing device that incorporates an asymmetrically loaded QPC. Spin-dependent transport through this asymmetrically loaded QPC is tested by the two-dimensional region and the spin detector QPC. Theoretical study of electron transport is based on density functional theory (DFT). For this purpose, we have implemented an algorithm based on the Kohn-Sham local spin density approximation (LSDA) model and adapted it for a parallel high-performance cluster with distributed memory at the National Supercomputer Center in Linköping.