We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Real-time detection of electron tunnelling in a quantum dot.
- Authors
Lu, Wei; Ji, Zhongqing; Pfeiffer, Loren; West, K W; Rimberg, A J
- Abstract
Nanostructures in which strong (Coulomb) interactions exist between electrons are predicted to exhibit temporal electronic correlations. Although there is ample experimental evidence that such correlations exist, electron dynamics in engineered nanostructures have been observed directly only on long timescales. The faster dynamics associated with electrical currents or charge fluctuations are usually inferred from direct (or quasi-direct) current measurements. Recently, interest in electron dynamics has risen, in part owing to the realization that additional information about electronic interactions can be found in the shot noise or higher statistical moments of a direct current. Furthermore, interest in quantum computation has stimulated investigation of quantum bit (qubit) readout techniques, which for many condensed-matter systems ultimately reduces to single-shot measurements of individual electronic charges. Here we report real-time observation of individual electron tunnelling events in a quantum dot using an integrated radio-frequency single-electron transistor. We use electron counting to measure directly the quantum dot's tunnelling rate and the occupational probabilities of its charge state. Our results provide evidence in favour of long (10 micros or more) inelastic scattering times in nearly isolated dots.
- Publication
Nature, 2003, Vol 423, Issue 6938, p422
- ISSN
0028-0836
- Publication type
Journal Article
- DOI
10.1038/nature01642