Stability diagrams of laterally coupled triple vertical quantum dots in triangular arrangement

We investigate three vertical quantum dots (QDs) laterally coupled in a triangular arrangement forming a triple QD (tQD) with common source and drain electrodes. The three equidistant dot mesas each have one gate electrode allowing control of the electrochemical potential in each QD. From the stability diagrams observed by measuring current through the tQD on sweeping the voltages on two of the gate electrodes for different values of voltage on the third gate electrode, we build up part of the three-dimensional stability diagram. Our device can be useful to reveal the consequences of interdot coupling on electronic states in tQDs.