Regensburg 2007 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 52: Transport properties
HL 52.4: Vortrag
Freitag, 30. März 2007, 11:45–12:00, H14
High frequency quantised charge transport through a periodically formed quantum dot — •B. Kästner1,2, M. D. Blumenthal2,3, L. Li2, S. Giblin2, T. J. B. M. Janssen2, and M. Pepper3 — 1PTB, 38100 Braunschweig, Germany — 2NPL, Teddington TW11 0LW, UK — 3University of Cambridge, Cambridge CB3 0HE, UK
We present experimental results on a novel approach to quantised charge pumping. Single electrons are transported through a periodically formed decoupled quantum dot. Phase-shifted sinusoidal radio frequency (RF) signals applied directly to two metallic gates are used to pump electrons through the dot at a current level of 0.54 nA, over an order of magnitude higher than in present single electron pumps. The relative amplitudes of the RF signals applied to the gates determines the direction of the pumped current. This new approach represents an alternative path to the realization of a high current high accuracy quantum standard for electrical current.