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

Abstract

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 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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Cited by in corpus (12)

• Symmetry breaking and quantum correlations in finite systems: Studies of quantum dots and ultracold Bose gases and related nuclear and chemical methods
• Quantum theory of the charge stability diagram of semiconductor double quantum dot systems
• Failure of standard approximations of the exchange coupling in nanostructures
• Effect of confinement potential shape on exchange interaction in coupled quantum dots
• Artificial quantum-dot Helium molecules: Electronic spectra, spin structures, and Heisenberg clusters
• Influence of confining potentials on the exchange coupling in double quantum dots
• Tuning the exchange interaction by electric field in laterally coupled quantum dots
• Size effects in the exchange coupling between two electrons in quantum wire quantum dots
• Simulation of Charge Stability Diagrams for Automated Tuning Solutions (SimCATS)
• Engineering Exchange Coupling in Double Elliptic Quantum Dots
• The von Neumann-Wigner theorem in quantum dot molecules
• Designed defects in 2D antidot lattices for quantum information processing