Incoherent tunnelling through two quantum dots with Coulomb interaction
P. Pals, A.MacKinnon (The Blackett Laboratory, Imperial College,, London, United Kingdom)
TL;DR
This paper investigates incoherent tunneling through two quantum dots with Coulomb interaction, revealing conditions for negative differential conductance and emphasizing the role of energy level matching beyond charge degeneracy points.
Contribution
It introduces a generalized master equation approach to analyze incoherent tunneling in coupled quantum dots considering discrete energy levels.
Findings
Negative differential conductance regions identified
Transport dominated by energy level matching
Incoherent tunneling influenced by Coulomb interaction
Abstract
The Ohmic conductance and current through two quantum dots in series is investigated for the case of incoherent tunnelling. A generalised master equation is employed to include the discrete nature of the energy levels. Regions of negative differential conductance can occur in the I-V characteristics. Transport is dominated by matching energy levels, even when they do not occur at the charge degeneracy points.
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