Exchange interaction and stability diagram of coupled quantu(14)

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.5:(Coloronline)Double-tripletpointseparationalongVL(orVR,VL=VR)axisasafunctionofthemagnetic eldBfor(a)d=50nmand(b)d=60nm.Thedataforsingletandthelowesttripletstatesarelabeledby” ”(bluecurve)and”+”(redcurve),respectively.Theupper(lower)insetineach gureshowstheexchangeenergyJasafunctionofthemagnetic eldwith(without)theZeemane ect.ThedataintheinsetsareobtainedatVL=VR=25meV.