Role of interactions in the far-infrared spectrum of a lateral quantum dot molecule

Abstract

We study the effects of electron-electron correlations and confinement potential on the far-infrared spectrum of a lateral two-electron quantum dot molecule by exact diagonalization. The calculated spectra directly reflect the lowered symmetry of the external confinement potential. Surprisingly, we find interactions to drive the spectrum towards that of a high-symmetry parabolic quantum dot. We conclude that far-infrared spectroscopy is suitable for probing effective confinement of the electrons in a quantum dot system, even if interaction effects cannot be resolved in a direct fashion.

4 pages, 2 figures

References in corpus (4)

• Two-electron quantum dot molecule: Composite particles and the spin phase diagram
• Wigner molecules in quantum dots: a quantum Monte Carlo study
• Influence of shape of quantum dots on their far-infrared absorption
• Collective charge-density excitations of non-circular quantum dots in a magnetic field

Cited by in corpus (9)

• Few-electron eigenstates of concentric double quantum rings
• Two-electron lateral quantum-dot molecules in a magnetic field
• Effect of confinement potential shape on exchange interaction in coupled quantum dots
• Variational Monte Carlo for Interacting Electrons in Quantum Dots
• Optical Anisotropy of Electronic Excitations in Elliptical Quantum Dots
• Tuning the exchange interaction by electric field in laterally coupled quantum dots
• Far-infrared spectra of lateral quantum dot molecules
• Electronic Correlations in Double Quantum Dots
• Singlet-triplet oscillations and far-infrared spectrum of four-minima quantum-dot molecule