We generalize the typical medium dynamical cluster approximation to multiband disordered systems. Using our extended formalism, we perform a systematic study of the non-local correlation effects induced by disorder on the density of states and the mobility edge of the three-dimensional two-band Anderson model. We include inter-band and intra-band hopping and an intra-band disorder potential. Our results are consistent with the ones obtained by the transfer matrix and the kernel polynomial methods. We apply the method to KxFe2−ySe2 with Fe vacancies. Despite the strong vacancy disorder and anisotropy, we find the material is not an Anderson insulator. Our results demonstrate the application of the typical medium dynamical cluster approximation method to study Anderson localization in real materials.
@article{arxiv.1509.04991,
title = {Study of multiband disordered systems using the typical medium dynamical cluster approximation},
author = {Yi Zhang and Hanna Terletska and C. Moore and Chinedu Ekuma and Ka-Ming Tam and Tom Berlijn and Wei Ku and Juana Moreno and Mark Jarrell},
journal= {arXiv preprint arXiv:1509.04991},
year = {2015}
}