Dissociation of vertical semiconductor diatomic artificial molecules.
We investigate the dissociation of few-electron circular vertical semiconductor double quantum dot artificial molecules at 0 T as a function of interdot distance. A slight mismatch introduced in the fabrication of the artificial molecules from nominally identical constituent quantum wells induces localization by offsetting the energy levels in the quantum dots by up to 2 meV, and this plays a crucial role in the appearance of the addition energy spectra as a function of coupling strength particularly in the weak coupling limit.
Pi
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Departament ECM, Facultat de Física, Universitat de Barcelona, E-08028 Barcelona, Spain.
Emperador
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A
Barranco
M
M
Garcias
F
F
Muraki
K
K
Tarucha
S
S
Austing
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DG