Quantum resistance standards with double 2DEG

A new generation of quantum Hall array resistance standards (QHARS) designed from GaAs/AlGaAs heterostructures with double two-dimensional electron gases (2DEGs) has been developed. First results of measurements carried out on a single Hall bar (R/sub K//4) and 50 Hall bars placed in parallel by triple connections (R/sub K//200) are presented.

[1]  F. Piquemal,et al.  QHE array resistance standards down to 129 /spl Omega/ , 2000, Conference on Precision Electromagnetic Measurements. Conference Digest. CPEM 2000 (Cat. No.00CH37031).

[2]  F. Delahaye,et al.  Series and parallel connection of multiterminal quantum Hall‐effect devices , 1993 .