Exchange interaction and stability diagram of coupled quantu(9)

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

2180(2005).

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11T.Hatano,M.Stopa,andS.Tarucha,Science309,268(2005).D.V.MelnikovandJ.-P.Leburton,Phys.Rev.B73,085320(2006).L.-X.Zhang,D.V.Melnikov,andJ.-P.Leburton(unpublished).Thevaluesofthechemicalpotentialsatwhichthecontourplotsaredrawnarechosentofacilitatedatarepresentation.Fortheinvestigatedmagnetic elds,therelativechangeofthecurvatureofaspeci cchemicalpotentialandtheDTPseparationislessthan5%fordi erentreferencevalues.

12Thesameconsiderationisobviouslyvalidforthetripletstatesaswell,albeitwithalargerquasilinearregion.

13D.V.MelnikovandJ.-P.Leburton(unpublished).