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    Scanning Tunnelling Microscope tagged posts

    Close to Absolute Zero, Electrons exhibit their Quantum Nature

    November 8, 2016, Categories  Physics, Technology/Electronics

    Keeping a close eye on everything: Christian Ast checks the connections of the scanning tunneling microscope (top). Researchers in the Nanoscale Science Department conduct their experiments in this instrument at lowest temperatures of a fifteen thousandth of a degree above absolute zero. The principle is always the same (bottom): A tunneling current (illustrated by the transparent bar) flows between an ultrafine tip and the sample, providing information about the properties of the sample. At these low temperatures the tunneling current reveals all of its quantum properties.

    Keeping a close eye on everything: Christian Ast checks the connections of the scanning tunneling microscope (top). Researchers in the Nanoscale Science Department conduct their experiments in this instrument at lowest temperatures of a fifteen thousandth of a degree above absolute zero. The principle is always the same (bottom): A tunneling current (illustrated by the transparent bar) flows between an ultrafine tip and the sample, providing information about the properties of the sample. At these low temperatures the tunneling current reveals all of its quantum properties. Credit: Tom Pingel (top), MPI for Solid State Research (bottom)

    What would happen if an electric current no longer flowed, but trickled instead? This was the question investigated by researchers working with Christian ...

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    Scientists Visualize Quantum Behavior of Hot Electrons for first time

    September 28, 2016, Categories  Physics, Technology/Electronics

    The Scanning Tunnelling Microscope used to inject electrons into a silicon surface at the University of Birmingham. Credit: Michelle Tennison

    The Scanning Tunnelling Microscope used to inject electrons into a silicon surface at the University of Birmingham. Credit: Michelle Tennison

    The findings present a promising step forward towards being able to manipulate and control the behavior of high energy, or ‘hot’, electrons. A Scanning Tunnelling Microscope was used to inject electrons into a silicon surface, decorated with toluene molecules. As the injected charge propagated from the tip, it induced the molecules to react and ‘lift off’ from the surface. By measuring the precise atomic positions from which molecules departed on injection, the team were able to identify that electrons were governed by quantum mechanics close to the tip, and then by more classical behavior further away.

    The team found the molecular lift-off was “su...

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