Exchange interaction and stability diagram of coupled quantu(15)

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

TABLES

TABLEI:Comparisonofthemagnitudeofthesecondorderderivativeκ(1)andκ(2)ofthechemicalpotentialcurvesµ(1)andµ(2)neartheirturningpointsforvariousinter-dotseparationsandmagnetic elds.κS(2)andκT(2)denotethevaluesforthesingletandthelowesttripletstate,respectively.

d=50nm

B(T)κ(1)κS(2)[κT(2)]κ(1)d=60nmκS(2)[κT(2)]