Exchange interaction and stability diagram of coupled quantu(13)

The charge stability diagram for two coupled quantum dots containing up to two electrons is computed in magnetic fields. One- and two-particle Schroedinger equations are solved by exact diagonalization to obtain the chemical potentials and exchange energy

FIG.4:(Coloronline)(a)Contourplotsofthechemicalpotentialsµ(1)(singleelectronstate,lowerbranches,solidcurves),µS(2)(two-electronsingletstate,upperbranches,solidcurves),andµT(2)(thelowesttwo-electrontripletstate,upperbranches,dashedcurves)atdi erentmagnetic eldsford=50nm.(b)Sameas(a)butatd=60nm.Inthecaseofd=60nmandB=0,thecontourlinesforµS(2)andµT(2)areindistinguishableonthescaleofthe gure.