![]() In this process, high-energy photons are emitted. ![]() It first accelerates electrons in semiconductor samples in one direction and then, after reversing the direction of the field, recollides them with the gap from which they were removed, so-called holes. The light field literally puts the charge carriers on a test track through the solid. The "pendulum" of this clock is given by the oscillating carrier wave of light-the fastest alternating field that can be controlled by humans. To measure the movement of electrons on such short time scales, the researchers developed a new type of attosecond stopwatch. Even light would only travel a distance of the order of an atom's diameter in an attosecond. The research team reports on their results in the current issue of the scientific journal Nature.Īn attosecond corresponds to the billionth part of a billionth of a second, which relates to a second as a second does to twice the age of the universe. This resolution is sufficient to investigate the smallest changes in the quantum dynamics of electrons caused by the attraction of other charge carriers or complex many-body correlations. ![]() Mackillo Kira from the Department of Electrical Engineering and Computer Science at the University of Michigan, U.S., have now for the first time successfully tracked the ultrafast motion of free electrons in solids with the mind-boggling precision of just a few hundred attoseconds. Rupert Huber from the Institute of Experimental and Applied Physics at the University of Regensburg, Germany, and Prof. ![]()
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