Disordered Hubbard model

Bản luận văn này có mục đích tìm hiểu về định xứ Anderson đồng thời dẫn giải chi tiết các công thức thu nhận được trong công trình "Constructing electronic phase diagram for the half – filled Hubbard model with disorder", cũng như kiểm tra lại tính chính xác của DMFT tuyến tính hóa được sử dụng trong công trình này.

52p capheviahe27 23-02-2021 19 3   Download

The electronic phase diagram of strongly correlated systems with disorder is constructed using the typical-medium theory. For half-filled system, the combination of the linearized dynamical mean field theory and equation of motion approach allows to derive the explicit equations determining the boundary between the correlated metal, Mott insulator, and Anderson insulator phases. Our phase diagram is consistent with those obtained by the more sophisticated methods.

6p thuyliebe 08-10-2018 24 1   Download

The electronic properties of strongly correlated systems with binary type of disorder are investigated using the coherent potential approximation. For half-filled system, two transitions from a band insulator via a metallic state to a Mott insulator are found with increasing the correlation strength of only one of the constituents. Our phase diagram is consistent with those obtained by the dynamical mean field theory.

6p thuyliebe 08-10-2018 32 1   Download