Logo Università degli Studi di Milano


Dipartimento di

 
 
Notizie  

On the time evolution of fermionic natural occupation numbers

13/12/2019 ore 11:30 Dip. di Fisica. Aula Caldirola.

Carlos Benavides, Institut für Physik Martin-Luther-Universität Halle-Wittenberg.

Pure fermionic states obey not only the Pauli exclusion principle but a stronger set of generalized Pauli constraints. This recent mathematical insight can be used to study the time evolution of highly correlated electronic systems. In this talk I will derive an approximate equation for the time evolution of the natural occupation numbers for such fermionic systems. The evolution of these numbers is connected to a geometrical and a dynamical terms attached to some of the Slater determinants appearing in the configuration-interaction expansion of the wave function. Our approach becomes exact for highly symmetric systems whenever the wave function possesses as many Slater determinants as independent occupation numbers.

 

13 dicembre 2019
Torna ad inizio pagina