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

Center for Quantized Electronic Structures (QUEST) and Department of Chemistry University of California - Santa Barbara, CA 93106-9510, USA

Corresponding author: pablot@df.uba.ar

Received: 7 August 2000
Accepted: 11 January 2001

Abstract

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.