Exchange and correlation effects in the transmission phase through a few-electron quantum dot

Details Exchange and correlation effects in the transmission phase through a few-electron quantum dot Exchange and correlation effects in the transmission phase through a few-electron quantum dot

2010-07-05

arxiv.org/abs/1007.0643v1

Physical Review B 82, 045310 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX 4.0, 6 pages, 3 b/w figures. Physical Review B (2010), in press

Scientific paper

10.1103/PhysRevB.82.045310

The transmission phase through a quantum dot with few electrons shows a complex, non-universal behavior. Here we combine configuration-interaction calculations ---treating rigorously Coulomb interaction--- and the Friedel sum rule to provide a rationale for the experimental findings. The phase evolution for more than two electrons is found to strongly depend on dot's shape and electron density, whereas from one to two the phase never lapses. In the Coulomb (Kondo) regime the phase shifts are significant fractions of pi (pi/2) for the second and subsequent charge addition if the dot is strongly correlated. These results are explained by the proper inclusion in the theory of Coulomb interaction, spin, and orbital degrees of freedom.

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