Transport properties of dual quantum dots

Transport properties of GaAs dual quantum dots are investigated by means of dual-channel current measurements. The total conductance of the dual quantum dots has a shoulder and a plateau near integer multiples of quantised conductance as if the dual quantum dots behave as a single quantum point contact. This novel behaviour in the total conductance is discussed on the basis of a multi-channel conductor model. Chemical-potential variation in the two-dimensional electron gas is proposed in three-terminal-like transport through the quantum dots.