Microscopic mechanisms of dephasing due to electron-electron interactions

Abstract

We develop a non-perturbative numerical method to study tunneling of a single electron through an Aharonov-Bohm ring where several strongly interacting electrons are bound. Inelastic processes and spin-flip scattering are taken into account. The method is applied to study microscopic mechanisms of dephasing in a non-trivial model. We show that electron-electron interactions described by the Hubbard Hamiltonian lead to strong dephasing: the transmission probability at flux $\Phi =\pi$ is high even at small interaction strength. In addition to inelastic scattering, we identify two energy conserving mechanisms of dephasing: symmetry-changing and spin-flip scattering. The many-electron state on the ring determines which of these mechanisms will be at play: transmitted current can occur either in elastic or inelastic channels, with or without changing the spin of the scattering electron.

11 pages, 16 figures Submitted to Phys. Rev. B

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Cited by in corpus (4)

• Non-equilibrium quantum transport in fully interacting single-molecule nanojunctions
• Do intradot electron-electron interactions induce dephasing?
• Many-body current formula and current conservation for non-equilibrium fully interacting nanojunctions
• Entangled electronic state via an interacting quantum dot