Transport properties of two laterally coupled vertical quantum dots in series with tunable inter-dot coupling

摘要

We describe the electronic properties of a double dot for which the lateralcoupling between the two vertical dots can be controlled in-situ with a centergate voltage (Vc) and the current flows through the two dots in series. When Vcis large and positive, the two dots merge. As Vc is made less positive, twodots are formed whose coupling is reduced. We measure charging diagrams forpositive and negative source-drain voltages in the weak coupling regime andobserve current rectification due to the Pauli spin blockade when the hyperfineinteraction between the electrons and the nuclei is suppressed.