Abstract
We theoretically investigated the dephasing in an Aharonov–Bohm interferometer containing a lateral double quantum dot induced by coupling with a quantum dot charge sensor. We employed the interpolative second-order perturbation theory to include the charge sensing Coulomb interaction. It is shown that the visibility of the Aharonov–Bohm oscillation of the linear conductance decreases monotonically as the sensing Coulomb interaction increases. In particular, for a weak sensing interaction regime, the visibility decreases parabolically, and it behaves linearly for a strong sensing interaction regime.
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