Condensed Matter Physics Seminar

Dr Malcolm Connolly, University of Cambridge

Friday 28 November 2014, 1500-1600
C1 Physics Building

Microscopy and control of graphene quantum devices

Graphene is a promising material for realising quantum devices for applications in quantum information and electrical metrology. In this seminar I first describe the operation of a graphene single-electron pump which works by the adiabatic transfer of charges between two series coupled quantum dots. These devices generate a net current equal to the fundamental electronic charge times the drive frequency and operate fast enough to create a new standard for electrical current based on the electron charge. I will then discuss how we use a low temperature scanning probe microscope to define and detect quantum interference and weakly confined states in graphene heterojunctions. In high magnetic field these structures exhibit quantum dot behaviour and therefore offer a potentially cleaner platform for developing single-electron pumps and qubits.