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'Racetrack' for fast electrons in semiconductor structures
Date:8/29/2008

beam epitaxy. In an ultrahigh vacuum chamber the source materials, e.g. gallium and arsenic, are evaporated at a background pressure 15 orders of magnitude lower than atmospheric pressure. The growth is highly controlled allowing deposition of atomic layers of GaAs and AlGaAs one by one.

The purity of the semiconductor crystal is determined by the quality of the vacuum in the molecular beam epitaxy system. PTB's new facility has an extremely powerful pumping system to produce ultra-low pressure in the growth chamber. Moreover, special cooling panels, adsorb residual impurities before they can be incorporated in the semiconductor crystal.

The result of these efforts are two-dimensional electron gases with electron mobilties up to 7.5 million cm2/Vs at low temperatures which is a five times higher compared to sam-ples from the standard epitaxy machine. The new structures thus provide a formula-1 race track for electrons to achieve highest mobilties.

By means of the new epitaxial technology PTB will promote the development of semicon-ductor single-electron pumps. Furthermore, the universality of electrical quantum Hall resistance metrology will be investigated focussing on measurements of the fractional quantum Hall effect.


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Contact: Klaus Pierz
Klaus.Pierz@ptb.de
49-053-159-22412
Physikalisch-Technische Bundesanstalt (PTB)
Source:Eurekalert

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