This work is split into two parts. In the first one, the YN band structure is carried out using the Density Functional Theory (DFT) and FP-LAPW (Full potential linear augmented plane waves). In the second one, the same YN band structure is calculated by using the tight-binding method. The tight binding parameters are determined for fitting to the first-principle energy values of the first part. The fitting method used was the least square minimum. We obtained good agreement between the first-principle bands and the TB bands for one point k in the First Brillouin zone.
Keywords: Band structure, DFT, Tight Binding, YN