Femtosecond-scale response of GaAs to ultrafast laser pulses

Traian Dumitrică, Roland E. Allen

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


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.

Original languageEnglish (US)
Article number081202
Pages (from-to)812021-812024
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number8
StatePublished - Aug 15 2002


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