Exchange energy tuned by asymmetry in artificial molecules

Szafran, B.; Peeters, F. M.; Bednarek, S.

doi:10.1103/physrevb.70.205318

Cited by 59 publications

(100 citation statements)

References 23 publications

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“…11 Our study 12 on electron systems in a single circular dot performed with a similar technique showed that the superposition of Gaussians very well approximates the angular momentum eigenstates. …”

Section: Double Dot Model and Methods Of Calculationsmentioning

confidence: 99%

Stark effect on the exciton spectra of vertically coupled quantum dots: Horizontal field orientation and nonaligned dots

2007

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We study the effect of an electric-field on an electron-hole pair in an asymmetric system of vertically coupled self-assembled quantum dots taking into account their non-perfect alignment. We show that the non-perfect alignment does not qualitatively influence the exciton Stark effect for the electric field applied in the growth direction, but can be detected by application of a perpendicular electric field. We demonstrate that the direction of the shift between the axes of non-aligned dots can be detected by rotation of a weak electric field within the plane of confinement. Already for a nearly perfect alignment the two-lowest energy bright exciton states possess antilocked extrema as function of the orientation angle of the horizontal field which appear when the field is parallel to the direction of the shift between the dot centers.

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Section: Double Dot Model and Methods Of Calculationsmentioning

confidence: 99%

Stark effect on the exciton spectra of vertically coupled quantum dots: Horizontal field orientation and nonaligned dots

2007

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“…12,13,18,[26][27][28][29][30][31][32][33] Magnetizations in QDs have been measured indirectly with transport measurements 34 and recently with a direct technique with improved sensitivity. 35 For both measurements, semiclassical approaches cannot explain the results.…”

Section: Introductionmentioning

confidence: 99%

Two-electron lateral quantum-dot molecules in a magnetic field

2005

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Laterally coupled quantum dot molecules are studied using exact diagonalization techniques. We examine the two-electron singlet-triplet energy difference as a function of magnetic field strength and investigate the magnetization and vortex formation of two-and four-minima lateral quantum dot molecules. Special attention is paid to the analysis of how the distorted symmetry affects the properties of quantum-dot molecules.

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“…While extensive theoretical work focuses on the dependence of J on the system paramenters such as the inter-dot separation, the tunneling barrier between the QDs, and the external magnetic field, 2,3,4,5 the charge stability diagram of coupled QDs 6 has been studied to a lesser extent. Meanwhile, recent advances in experimental techniques have made it possible to study coupled QDs in the few-electron regime when each QD contains only one conduction electron (see, e.g., Refs.…”

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Exchange interaction and stability diagram of coupled quantum dots in magnetic fields

Zhang

Melnikov

Leburton³

2006

Phys. Rev. B

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The charge stability diagram for two coupled quantum dots containing up to two electrons is computed in magnetic fields. One-and two-particle Schrödinger equations are solved by exact diagonalization to obtain the chemical potentials and exchange energy in these systems. By analyzing the chemical potentials variation with external biases and magnetic fields, it is possible to distinguish between the weak and strong inter-dot couplings. The variation of the chemical potential curvatures and the double-triple point separations in the stability diagrams confirms the inter-dot coupling decrease with increasing magnetic fields. The computed exchange energies are also found to be significantly smaller than the values estimated from the stability diagram.

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Exchange energy tuned by asymmetry in artificial molecules

Cited by 59 publications

References 23 publications

Stark effect on the exciton spectra of vertically coupled quantum dots: Horizontal field orientation and nonaligned dots

Stark effect on the exciton spectra of vertically coupled quantum dots: Horizontal field orientation and nonaligned dots

Two-electron lateral quantum-dot molecules in a magnetic field

Exchange interaction and stability diagram of coupled quantum dots in magnetic fields

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