Statut  Confirmé 
Série  LPENSMDQ 
Domaines  condmat 
Date  Vendredi 18 Novembre 2022 
Heure  14:30 
Institut  LPENS 
Salle  L369 
Nom de l'orateur  Schumacher 
Prenom de l'orateur  Hans 
Addresse email de l'orateur  
Institution de l'orateur  PhysikalischTechnische Bundesanstalt, PTB, Braunschweig 
Titre  Single Electron Pumps for the Revised SI Ampere 
Résumé  On May 20th, 2019 the revised International System of Units (the SI) entered into force. Since then, the SI base units are defined by fixed values of a set of fundamental constants, among them the Planck constant h and the elementary charge e. A direct primary standard for the electrical base unit ampere could now be realized by socalled single electron pumps. They are based on single electron transistors that are driven by an oscillating gate voltage with frequency f. During one oscillation cycle one electron is first captured from source and later ejected to drain thereby generating a quantized current I = ef. In my talk I will review the present state of single electron pumps for the direct representation of the ampere. I will show that semiconductorbased single electron pumps are the most advanced candidates for primary current standards allowing high enough currents in combination with excellent quantization accuracy. I will further discuss insitu measurements of pump errors by single charge detection and I will give a short outlook on further prospects of single electron pumps like the generation of shot noise free currents or the field of electron quantum optics. 
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