Coherent transport in a two-electron quantum dot molecule

Details Coherent transport in a two-electron quantum dot molecule Coherent transport in a two-electron quantum dot molecule

2001-09-05

arxiv.org/abs/cond-mat/0109082v2

Phys. Rev. B 65, 113304 (2002).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures; the section dealing with the perturbative treatment of the Floquet states has been substantially expanded

Scientific paper

10.1103/PhysRevB.65.113304

We investigate the dynamics of two interacting electrons confined to a pair of coupled quantum dots driven by an external AC field. By numerically integrating the two-electron Schroedinger equation in time, we find that for certain values of the strength and frequency of the AC field we can cause the electrons to be localised within the same dot, in spite of the Coulomb repulsion between them. Reducing the system to an effective two-site model of Hubbard type and applying Floquet theory leads to a detailed understanding of this effect. This demonstrates the possibility of using appropriate AC fields to manipulate entangled states in mesoscopic devices on extremely short timescales, which is an essential component of practical schemes for quantum information processing.

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