Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 44: Poster Session: Quantum Dots and Wires - Transport & Optical Properties

HL 44.3: Poster

Dienstag, 27. März 2012, 09:30–12:30, Poster D

Characterization of an electron-accounting circuit — •Michael Wulf, Lukas Fricke, Frank Hohls, Bernd Kaestner, Ralf Dolata, Philipp Mirovsky, Klaus Pierz, Thomas Weimann, and Hans W. Schumacher — Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig

Operating single-electron pumps, based on dynamic quantum dots [1,2], in series while monitoring each of their outputs with single-electron resolution allows the characterization of the individual components by counting. This is complementary to previous measurements of these devices, where the time-averaged pumped current is measured [1,2] or its noise spectrum [3].

It is shown that pump operation is consistent with the required single electron resolution of metallic single-electron transistors (SET) and the rates of pump errors are measured in a low-frequency electron-counting experiment.

Time-domain correlations of the transistor signals allow identification and subsequent accounting for pump errors. This constitutes a first proof-of-principle of our electron accounting scheme [4], which aims to meet the requirements of quantum-current metrology even for a circuit built of imperfect components.

[1] M. D. Blumenthal et al., Nat. Phys. 3, 343 (2007)

[2] B. Kaestner et al., Phys. Rev. B 77, 153301 (2008)

[3] N. Maire et al., Appl. Phys. Lett. 92, 082112 (2008)

[4] M. Wulf and A. B. Zorin, e-print arXiv:0811.3927