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SUMMARY:Quantized charge pumping with tunable-barrier quantum dots as elec
 tron &quot\;disequilibration&quot\; problem - Vyacheslavs Kashcheyevs\, Un
 iversity of Latvia\, Riga\, Latvia
DTSTART:20131204T141500Z
DTEND:20131204T151500Z
UID:TALK48431@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:Few-electron sources based  on periodic trapping and controlle
 d release of individual charges in a nanoelectronic circuit open up new pr
 ospects for exploration of new equilibrium transport and solid-state quant
 um information processing. Quantized charge pumping with dynamic quantum d
 ots\, pioneered by Cambridge-NPL collaboration\, has recently progressed t
 o high levels of robustness\, speed and accuracy.  This remarkable experim
 ental progress has been in part driven by a gradually improving theoretica
 l understanding of the physical mechanisms of charge capture and the succe
 ss of the decay cascade model for backtunneling. In this talk I will prese
 nt the latest theory results from the Riga group\, and explain the conject
 ured dynamical energy scales that control the current-voltage characterist
 ics of a non-adiabatic single-electron pump. \nThe theoretical separation 
 of competing error processes is supported by re-interpretation of existing
  experimental data\, and by new sets of experiments performed at Physikali
 sch-Technische Bundesanstalt in Braunschweig\, Germany. Prospects for obse
 rving Landau-Zener-backtunneling interference in high-precision measuremen
 ts of charge quantization plateaux will be discussed.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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