On double barrier quantum well conductance effects due to exchange and correlation

Abstract

PACS 71.15.Mb, 71.45.Gm, 73.63.Hs Conductance investigations in double barrier resonant tunneling (DBRT) structures under an applied voltage usually make use of the BenDaniel -Duke equation (BDK), coupled to the Poisson equation, to incorporate electron interactions through the Hartree term in a self-consistent way. By including an extra selfconsistency condition, it is possible to go beyond the Hartree approximation and include exchange and correlation (EC) effects through the local density approximation (LDA). In this paper, the inclusion of EC effects is made by means of the analytically parametrized xc u of Hedin and Lundqvist. A comparison with previous work that excludes such effects is carried out for the energy spectrum as well as for the field dependent conductance in a GaAs/AlGaAs DBRT structure.