Size effects in the exchange coupling between two electrons in quantum wire quantum dots

Abstract

We theoretically investigate the properties of a two-electron system confined in the three-dimensional potential of coupled quantum dots formed in a quantum wire. For this purpose, we implement a variational Heitler-London method that minimize the system energies with respect to variational parameters in electron trial wavefunctions. We find that tunneling and exchange couplings exponentially decay with increasing inter-dot distance and inter-dot barrier height. In the quasi-one-dimensional limit achieved by reducing the wire diameter, we find that the overlap between the dots decreases, which results in a drop of the exchange coupling. We also discuss the validity of our variational Heitler-London method with respect to the model potential parameters, and compare our results with available experimental data to find good agreement between the two approaches.

10 pages, 8 figures

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Cited by in corpus (5)

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• Few-electron artificial molecules formed by laterally coupled quantum rings
• Near-threshold properties of the electronic density of layered quantum-dots
• Tuning the exchange interaction by electric field in laterally coupled quantum dots
• Resonance states in a cylindrical quantum dot with an external magnetic field