First-principles electronic structure predictions for semiconductor spintronics

June 10 2009
Types d’événements
Séminaire SPCSI
Athanasios Chantis
SPEC Bât 466 p.111 (1er ét.)
Configuration de la salle en séminaire ou réunion
30 places
Vidéo Projecteur
10/06/2009
from 11:00

Studying the electronic structure and magnetic properties of novel materials has been a driving force for new technologies and fundamental understanding of nature. In this talk, I will present our studies in the emerging technology of semiconductor spintronics. Using our recently developed first principles methods, we have shown that the electronic structure of ferromagnet-semiconductor interface induces intriguing, newly discovered behavior of spin dependent tunneling electrons. These effects can introduce a new class of spintronic devices and proved to be extremely valuable in interpreting recent experimental measurements. I will also introduce the Quasiparticle self-consistent GW electronic structure method (G=Green’s function, W=screened Coulomb interaction). This method provides exciting new capabilities for first principles prediction of material parameters and fundamental understanding of their electronic structure. I will demonstrate this on several examples related to semiconductor spintronics. Future plans that involve first-principles and semiempirical approaches for the study of electronic and magnetic properties at the nanoscale will be discussed.

Los Alamos National Laboratory, Los Alamos, New Mexico, USA