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SUMMARY:Quantized current and voltage sources based on non-adiabatic charg
 e pumping - Dr Bernd Kaestner\, PTB Braunschweig
DTSTART:20111010T131500Z
DTEND:20111010T150000Z
UID:TALK33712@talks.cam.ac.uk
CONTACT:Emma Faid
DESCRIPTION:Charge pumping is a transport mechanism of generating electric
  current in the absence of a bias voltage. In the non-adiabatic regime the
  system is driven out of equilibrium and the ability to control the number
  of pumped electrons per modulation cycle has long been considered unfeasi
 ble. Non-adiabatic pumping with high precision has recently been realized 
 in tunable barrier devices\, following the advances in surface-acoustic-wa
 ve-driven transport. The (re-)discovery of this mechanism provided new mom
 entum to the developments of quantized current sources in the field of met
 rology. This talk discusses the pumping mechanism\, its potential precisio
 n and its wider applications\, including quantized voltage generation and 
 excited state preparation.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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