Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 33: Poster I: Transport, including Magnetic-Field Effects

HL 33.8: Poster

Dienstag, 23. März 2010, 18:30–20:30, Poster D1

Serial arrays of square Quantum Hall devices for resistance standards — •Jens Könemann, Franz-Josef Ahlers, Klaus Pierz, and Hans Werner Schumacher — Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig

Combining several Hall bars in series or in parallel with the help of the multiple series connection technique [1] allow to realize quantum resistance standards for resistance values from, e.g., 100 Ω to 1 MΩ. One of the necessary checks for verifying such a device as a resistance standard comprises the reversal of the magnetic field orientation. However, for serial arrays such a reversal intrinsically results in different resistance values for the two field orientations. Here, we propose a scheme to circumvent this restriction. It relies on interchanging the voltage and current probes together with the magnetic field inversion using a totally symmetric design based on square Hall bars. First device realizations are presented.
[1] F. Delahaye, J. Appl. Phys., Vol. 73, 7914 (1993).