Transport in serial spinful multiple-dot systems: The role of electron-electron interactions and coherences
arXiv:1501.02974 · doi:10.1038/srep22761
Abstract
Quantum dots are nanoscopic systems, where carriers are confined in all three spatial directions. Such nanoscopic systems are suitable for fundamental studies of quantum mechanics and are candidates for applications such as quantum information processing. It was also proposed that linear arrangements of quantum dots could be used as quantum cascade laser. In this work we study the impact of electron-electron interactions on transport in a spinful serial triple quantum dot system weakly coupled to two leads. We find that due to electron-electron scattering processes the transport is enabled beyond the common single-particle transmission channels. This shows that the scenario in the serial quantum dots intrinsically deviates from layered structures such as quantum cascade lasers, where the presence of well-defined single-particle resonances between neighboring levels are crucial for device operation. Additionally, we check the validity of the Pauli master equation by comparing it with the first-order von Neumann approach. Here we demonstrate that coherences are of relevance if the energy spacing of the eigenstates is smaller than the lead transition rate multiplied by .
12 pages, 7 figures
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- Violation of Onsager's theorem in approximate master equation approaches
- Steady-state Peierls transition in nanotube quantum simulator
- Thermal transport controlled by intra- and inter-dot Coulomb interactions in sequential and cotunneling serially-coupled double quantum dots
- Thermal transport driven by Coulomb interactions in quantum dots: Enhancement of thermoelectric and heat currents
- Quantifying the impact of phonon scattering on electrical and thermal transport in quantum dots
- Controlling thermoelectric, heat, and energy currents through a quantum dot in sequential and cotunneling Coulomb-blockade regimes
- Berry-phase effect in single molecule magnets: analytical and numerical results