Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-06-15
Phys. Rev. B 76, 195317 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 6 figures, RevTex4 two-column format, submitted
Scientific paper
10.1103/PhysRevB.76.195317
We study theoretically the entanglement created in a scattering between an electron, incoming from a source lead, and another electron bound in the ground state of a quantum dot, connected to two leads. We analyze the role played by the different kinds of resonances in the transmission spectra and by the number of scattering channels, into the amount of quantum correlations between the two identical carriers. It is shown that the entanglement between their energy states is not sensitive to the presence of Breit-Wigner resonances, while it presents a peculiar behavior in correspondence of Fano peaks: two close maxima separated by a minimum, for a two-channel scattering, a single maximum for a multi-channel scattering. Such a behavior is ascribed to the different mechanisms characterizing the two types of resonances. Our results suggest that the production and detection of entanglement in quantum dot structures may be controlled by the manipulation of Fano resonances through external fields.
Bertoni Andrea
Bordone Paolo
Buscemi Fabrizio
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