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Femtosecond-scale response of GaAs to ultrafast laser pulses Traian Dumitrica* and Roland E. Allen

Summary: Femtosecond-scale response of GaAs to ultrafast laser pulses
Traian Dumitrica* and Roland E. Allen
Department of Physics, Texas A&M University, College Station, Texas 77843
Received 30 May 2002; published 6 August 2002
We present nonadiabatic simulations of the coherent response of crystalline GaAs irradiated by intense
femtosecond-scale laser pulses. Above a threshold fluence, which corresponds to promotion of about 12% of
the valence electrons into the conduction band, the lattice is destabilized and the electronic band gap collapses
to zero. This confirms the nonthermal nature of recently observed structural changes driven by electronic
excitations and occurring during the first few hundred femtoseconds.
DOI: 10.1103/PhysRevB.66.081202 PACS number s : 71.55.Eq
Recent progress in femtosecond-scale laser pulses has
made feasible laboratory experiments at unprecedented pow-
ers, magnetic fields, pressures, temperatures, and accelera-
tions. There is great potential for applications, including de-
velopment of high-frequency lasers and investigation of the
properties of plasmas and condensed matter under extreme
conditions. At the same time, there is increasing theoretical
interest in nonperturbative calculations which include intense
laser fields.1
In particular, the interaction of femtosecond-scale laser


Source: Allen, Roland E. - Department of Physics and Astronomy, Texas A&M University
Dumitrica,Traian - Department of Mechanical Engineering, University of Minnesota


Collections: Materials Science; Physics