Programme

P.56 -- Poster, NCTP-43

Date: Wednesday, 1 August 2018

Time: 08:30 - 10:00

Zero bias anomaly formation due to hopping mechanism in the two-site Anderson-Hubbard model

Giang Huong Bach

Faculty of Physics, VNU University of Science, 334 Nguyen Trai Street, Thanh Xuan, Hanoi, Vietnam

The Anderson-Hubbard model considers the correlation between disorder and interaction in the strongly correlated electron systems. Both disorder and on-site Coulomb interaction drive metal-insulator transition at half-filling but the density of states behaves in different ways around a Fermi energy. A zero bias anomaly (ZBA) referring to a V-shaped anomaly of the density of states at the Fermi energy occurs in the strong disorder and strong interaction in stead of a hard Coulomb gap in an insulator phase of strongly correlated electron systems at half-filling. In this talk, we will use an Gaussian distribution for disorder to analyze the interplay of disorder and interaction in the formation of the ZBA in a two-site system for the Anderson-Hubbard model. The phase diagram of ground states with different numbers of electron reveals two important configurations in which the hopping mechanism between nearest neighbors are favored to reduce the degeneracy of the ground state energy in the atomic limit, which results in the formation of the ZBA.

Presenter: Bach Huong Giang