CPM Seminar

Charge Detection and Transport Through a Ring of Few Electron Quantum Dots

Andy Sachrajda

Institute for Microstructural Sciences
National Research Council of Canada

In this talk I will describe measurements through a ring of three few electron quantum dots. Over the last year several groups have been working to develop three quantum dot systems. I will briefly describe what potential new physics and functionalities are motivating these efforts. I will then focus on three areas where we have made measurements (1) The stability diagram, (ii) Spin Blockade and (iii) Coherent transport. The stability diagram results reveal an important role for quantum cellular automata effects in these circuits. Both spin blockade and coherent transport effects have been observed but remain only partially understood. Finally a brief description will be given of a charge detection back action effect that needs to be taken into account.