Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-10-29
Phys. Rev. B 69, 165312 (2004).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 6 eps figures V2. Minor changes, this version to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.69.165312
We investigate the dynamics of two interacting electrons moving in a one-dimensional array of quantum dots under the influence of an ac-field. We show that the system exhibits two distinct regimes of behavior, depending on the ratio of the strength of the driving field to the inter-electron Coulomb repulsion. When the ac-field dominates, an effect termed coherent destruction of tunneling occurs at certain frequencies, in which transport along the array is suppressed. In the other, weak-driving, regime we find the surprising result that the two electrons can bind into a single composite particle -- despite the strong Coulomb repulsion between them -- which can then be controlled by the ac-field in an analogous way. We show how calculation of the Floquet quasienergies of the system explains these results, and thus how ac-fields can be used to control the localization of interacting electron systems.
Creffield Charles E.
Platero Gloria
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