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

Abstract

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.

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

References in corpus (11)

• Full configuration interaction approach to the few-electron problem in artificial atoms
• A molecular state of correlated electrons in a quantum dot
• Mesoscopic to universal crossover of transmission phase of multi-level quantum dots
• Coulomb versus spin-orbit interaction in few-electron carbon-nanotube quantum dots
• Transmission phase of a singly occupied quantum dot in the Kondo regime
• Correlated electrons in optically-tunable quantum dots: Building an electron dimer molecule
• Nonuniversal transmission phase lapses through a quantum dot: An exact-diagonalization of the many-body transport problem
• Friedel sum rule for an interacting multiorbital quantum dot
• Level-occupation switching of the Quantum Dot, and phase anomalies in mesoscopic interferometry
• Lapse of transmission phase and electron molecules in quantum dots
• Phase lapses in scattering through multi-electron quantum dots: Mean-field and few-particle regimes