Detection of topological transitions by transport through molecules and nanodevices

Abstract

The phase transitions of an interacting electronic system weakly coupled to free-electron which results by zero-bias conditions, were investigated. The phase transitions were expressed in terms of two effective impurity models for cases with and without spin degeneracy. The weight of first conductance peak as a function of external flux or of difference in gate voltages between even and odd sites allows to identify topological charge transition was also demonstrated using half-filled ionic Hubbard ring. The results show that conductance is expressed in terms of spectral density of an EAM, which illustrates breaking of the Kondo effect by an applied field.