A NEW APPROACH TO THE ELECTRONIC-STRUCTURE OF 2-DIMENSIONAL DISORDERED ALLOYS

We propose a novel method to calculate the electronic Density of State s (DOS) of a two dimensional disordered binary alloy. The method is hi ghly reliable and numerically efficient, and Short Range Order (SRO) c orrelations can be included with no extra computational cost. The appr oach devised rests on one dimensional calculations and is applied to v ery long stripes of finite width, the bulk regime being achieved with a relatively small number of chains in the disordered case. Our approa ch is exact for the pure case and predicts the correct DOS structure i n important limits, such as the segregated, random, and ordered alloy regimes. We also suggest important extensions of the present work.