Electronic states in an infinite one-dimensional random binary quantum wire in the presence electric field

摘要

We use a tight-binding Hamiltonian for an infinite quantum wire with substitusional disorder of A and B atoms in a uniform electric field and calculate the density of states by coherent-potential approximation method .The electric field produces a little oscillation on the local density of states and by increasing the strength of the electric field the amplitudes of the oscillations grow up and they becomes more localized too. Also, by increasing the strength of the electric field, the range of the extension of the energy spread out. The density of states at E=0 versus a parameter which depends on electric field, is calculated and it shows oscillating pattern too. The local density of states for the different sites is calculated and all of them are similar except a shift which is proportional to the strength of the electric field.