Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-02-06
Phys. Rev. B 72, 205432 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 11 figures, added references, extended discussion
Scientific paper
10.1103/PhysRevB.72.205432
We study the formation of molecular states in a two-electron quantum dot as a function of the barrier potential dividing the dot. The increasing barrier potential drives the two electron system from an artificial helium atom to an artificial hydrogen molecule. To study this strongly coupled regime, we introduce variational wavefunctions which describe accurately two electrons in a single dot, and then study their mixing induced by the barrier. The evolution of the singlet-triplet gap with the barrier potential and with an external magnetic field is analyzed.
Dybalski Wojciech
Hawrylak Pawel
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