Counting Electrons

Bidirectional counting of single electrons.

A bidirectional single-electron counting device is demonstrated. Individual electrons flowing in forward and reverse directions through a double quantum dot are detected with a quantum point contact acting as a charge sensor. A comprehensive statistical analysis in the frequency and time domains and of higher order moments of noise reveals antibunching correlation in single-electron transport t...

Full counting statistics of interacting electrons

D.A. Bagrets1,2,∗, Y. Utsumi1,3, D. S. Golubev1,2,4, and Gerd Schön1,2,∗∗ 1 Institut für Theoretische Festköperphysik and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe, 76128 Karlsruhe, Germany 2 Forschungszentrum Karlsruhe, Institut für Nanotechnologie, 76021 Karlsruhe, Germany 3 Condensed Matter Theory Laboratory, The Institute of Physical and Chemical Research (RIKEN)...

Supporting Online Material for Bidirectional Counting of Single Electrons

Correlated Counting of Single Electrons in a Nanowire Double Quantum Dot

We report on correlated real-time detection of individual electrons in an InAs nanowire double quantum dot. Two self-aligned quantum point contacts in an underlying two-dimensional electron gas material serve as highly sensitive charge detectors for the double quantum dot. Tunnel processes of individual electrons and all tunnel rates are determined by simultaneous measurements of the correlated...

Counting electrons transferred through a thin alumina film into Au chains.

Low-temperature STM measurements combined with density functional theory calculations are employed to study the adsorption of gold on alumina/NiAl(110). The binding of Au monomers involves breaking of an oxide Al-O bond below the adatom and stabilizing the hence undercoordinated O ion by forming a new bond to an Al atom in the NiAl. The adsorption implies negative charging of the adatom. The li...