Symbolbild (Universität Paderborn, Besim Mazhiqi)
Scientists reveal that nonadiabatic tunneling is crucial for understanding high harmonic generation from semiconductors When matter is exposed to highly intense electromagnetic radiation, nonlinearities of the material may lead to the emission of light that contains very high multiples of the incident frequency. This process is called high harmonic generation (HHG) and can be used for the generation of extremely short light pulses with durations in the range of attoseconds (in 1 attosecond, i.e., 10-18 s, light travels just 0.3 nanometer which is comparable to the diameter of atoms!). Such pulses form the basis of the rapidly developing field of attosecond science and can be used to resolve and explore ultrafast processes inside matter. ...
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