What is it about?
The motion of a free charge subjected to a harmonic electromagnetic wave with transients is analyzed. The two central features of a charge - field interaction with a time dependent wave envelope are the drift or remnant velocity and the charge displacement. The former phenomenon has been observed in above threshold ionization and plasma residual-current density generation by few- cycle laser pulses. The particle shift is a feature that may prove useful for coherent manipulation. Analytical expressions in order to obtain the extrema for the velocity and displacement for a finite gating time are presented.
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Why is it important?
Transient electromagnetic fields can impart momentum to the charges producing a drift velocity.
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This page is a summary of: Charge motion under ultrafast harmonic wave switching, January 2010, American Institute of Physics, DOI: 10.1063/1.3536614.
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