Nonuniversal transmission phase lapses through a quantum dot: An exact-diagonalization of the many-body transport problem

Details Nonuniversal transmission phase lapses through a quantum dot: An exact-diagonalization of the many-body transport problem Nonuniversal transmission phase lapses through a quantum dot: An exact-diagonalization of the many-body transport problem

2008-02-07

arxiv.org/abs/0802.1064v2

Phys. Rev. Lett. 101, 136803 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Published version. REVTEX4. 4 pages with 3 color figures. For related papers, see http://www.prism.gatech.edu/~ph274cy/

Scientific paper

10.1103/PhysRevLett.101.136803

Systematic trends of nonuniversal behavior of electron transmission phases through a quantum dot, with no phase lapse for the transition N=1 -> N=2 and a lapse of pi for the N=2 -> N=3 transition, are predicted, in agreement with experiments, from many-body transport calculations involving exact diagonalization of the dot Hamiltonian. The results favor shape anisotropy of the dot and strong e-e repulsion with consequent electron localization, showing dependence on spin configurations and the participation of excited doorway transmission channels.

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