Correlated charge polarization in a chain of coupled quantum dots

Details Correlated charge polarization in a chain of coupled quantum dots Correlated charge polarization in a chain of coupled quantum dots

1997-09-08

arxiv.org/abs/cond-mat/9709098v1

Physical Review B 58, R1746 (1998).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 3 figures, 1 table

Scientific paper

10.1103/PhysRevB.58.R1746

Coherent charge transfer in a linear array of tunnel-coupled quantum dots, electrostatically coupled to external gates, is investigated using the Bethe ansatz for a symmetrically biased Hubbard chain. Charge polarization in this correlated system is shown to proceed via two distinct processes: formation of bound states in the metallic phase, and charge transfer processes corresponding to a superposition of antibound states at opposite ends of the chain in the Mott-insulating phase. The polarizability in the insulating phase of the chain exhibits a universal scaling behavior, while the polarization charge in the metallic phase of the model is shown to be quantized in units of $e/2$.

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