Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 52: Transport properties

HL 52.4: Talk

Friday, March 30, 2007, 11:45–12:00, H14

High frequency quantised charge transport through a periodically formed quantum dot — •B. Kästner^1,2, M. D. Blumenthal^2,3, 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.