Localization and entanglement of two interacting electrons in a quantum-dot molecule

Details Localization and entanglement of two interacting electrons in a quantum-dot molecule Localization and entanglement of two interacting electrons in a quantum-dot molecule

2000-07-26

arxiv.org/abs/cond-mat/0007427v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1209/epl/i2001-00219-7

The localization of two interacting electrons in a coupled-quantum-dots semiconductor structure is demonstrated through numerical calculations of the time evolution of the two-electron wave function including the Coulomb interaction between the electrons. The transition from the ground state to a localized state is induced by an external, time-dependent, uniform electric field. It is found that while an appropriate constant field can localize both electrons in one of the wells, oscillatory fields can induce roughly equal probabilities for both electrons to be localized in either well, generating an interesting type of localized and entangled state. We also show that shifting the field suddenly to an appropriate constant value can maintain in time both types of localization.

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