Program

O.8 -- Oral, NCTP-40

Date: Tuesday, 28 July 2015

Time: 11h20 - 11h40

Negative charge transfer to the surface in the electron-hole asymmetric models.

Giang Huong Bach

VNU University of Science

Ising-like dynamic Hubbard model describes a single electronic band model with an auxiliary spin-1/2 degree of freedom in order to capture physics of a solid with hydrogen-like atoms. This type of models proves that electrons becomes more strongly correlated when the number of electrons increase, which is presented by the inversely proportional to electron number filling of quasi-particle weight in a bulk system. Dynamical mean field theory calculations show that electrons in the surface are even more strongly correlated since electrons prefer residing in the surface in order to take advantage of lowering kinetic energy in the interior. The negative charge transfer to the surface is investigated in detail under the effect of parameters, for example on-site U Coulomb potential, g coupling between auxiliary field with the electronic band...

Presenter: Giang Huong Bach