Project Details
Projekt
Dynamics of non-adiabatic single electron pumping
Subject Area
Experimental Condensed Matter Physics
Term
from 2009 to 2014
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 110080797
The controlled pumping of single electrons has been intensively studied during the last years in devices which are based on a quasi-adiabatic shuttling of electrons. Recently a novel nonadiabatic single parameter GHz single-electron pumping has been observed in semiconductor nanostructures. In this approach the electric potential of the nanostructure is modulated periodically in time by means of only a single oscillating gate voltage. Theoretical analysis of the mechanism promises high frequency operation, robustness against variation of operation parameters and low error rate. An optimized non-adiabatic single electron pump could therefore find various applications in the field of quantum electronics and quantum information processing. In this project the dynamics of this non-adiabatic single electron pumping will be experimentally scrutinized. Noise measurements of the pumped single charge current, time resolved charge detection in a differential pump setup and single cycle pumping combined with single electron counting will be used to analyse the dynamics of the pumping process. The effects of charging and discharging will be distinguished and the pumping statistics will be investigated. The expected results will allow a deep insight into the charge dynamics of nanostructures containing small numbers of electrons. They will further provide the tools for designing optimized high frequency single electron pumps for future applications in the field of quantum electronics.
DFG Programme
Research Grants
Participating Persons
Professor Dr. Rolf J. Haug; Dr. Bernd Kästner
