Electron-electron interactions as a dominant factor for transport in multiple-dot systems

We study the impact of electron-electron interaction in a serial triple quantum dot system coupled to leads. Taking into account the full many-body eigenstates, we find that transport is enabled beyond the common transmission channels due to electron-electron scattering processes. Furthermore the multitude of many-particle states allows for current flow under a wide range of configurations of single particle levels. Thus, the scenario in coupled quantum dots intrinsically deviates from layered structures, where distinct resonances between neighboring levels are crucial for current flow.