Universal fluctuations of Coulomb blockade peaks in quantum dots

• Published in: Superlattices and microstructures Vol. 21; no. 1; pp. 43 - 48
• Main Authors: Patel, S.R., Cronenwett, S.M., Huibers, A.G., Switkes, M., Folk, J.A., Marcus, C.M., Campman, K., Gossard, A.C.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.01.1997; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Coulomb blockade; Coulomb blockade; single-electron tunneling; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport in mesoscopic systems; Exact sciences and technology; mesoscopic fluctuations; Physics; quantum dots; quantum dots; Coulomb blockade; mesoscopic fluctuations; Aluminium arsenides; Coulomb field; Gallium arsenides; Inorganic compounds; Quantum dots; Ternary compounds; Magnetic field effects; Theoretical study; Binary compounds; III-V semiconductors
• ISSN: 0749-6036; 1096-3677
• DOI: 10.1006/spmi.1996.0139

We describe recent measurements of the statistics and parametric correlations of Coulomb blockade peak heights in shape-deformable GaAs/A1xGa1−xAs quantum dots. We find good agreement between the measured distributions of peak heights and probability distributions predicted by random matrix theory for bothB= 0 andB≠ 0. The measured magnetic flux correlation lengthϕcis of the order of but less than one flux quantum through the dot,ϕc∼ 0.8ϕ0, inconsistent withϕcpredicted by universal scaling theory for isolated chaotic quantum dots.