Subsurface charge accumulation imaging of a quantum Hall liquid

Article Abstract:

New microscopic models have been developed for electrical conduction which are based on two-dimensional electron systems which cause the quantum Hall effect. A technique for cryogenic scanning known as 'subsurface charge accumulation' imaging allows the examination of electron mobility within materials. The technique involves measuring local charge accumulation whilst applying an alternating current at frequencies of about 100 kHz. Areas of 1-20 micrometers square can be scanned with a resolution of 900 Angstroms.

Research and Development in the Physical, Engineering, and Life Sciences, Research and Testing Services, Scientific Research and Development Services, Research & Development-Universities, Physics, Quantum Hall effect, Probes (Electronic instruments), Electron mobility, University research

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Electrons in artificial atoms

Article Abstract:

Advances in semiconductor technology have enabled the construction of minute structures that can hold just one mobile electron. The ability to control electron quantity in artificial atoms and to measure the energy needed for adding electrons has made feasible atomic physics experiments that are otherwise impossible in real atoms. Such experiments could lead to the discovery of the limit of small-sized electronics.

Atoms

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Dragging single electrons

Article Abstract:

A new silicon device may make it easier to measure electric current in fundamental units of charge and frequency.

Usage, Silicon

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