Response of semiconductors and fullerenes to ultrashort and ultra-intense laser pulses

ABSTRACTWe report new theoretical studies of the electronic and structural response of materials to fast intense laser pulses, with durations 10100 feintoseconds and intensities up to 10 terawatts/cm2. The results provide still stronger evidence that GaAs undergoes a true nonthermal phase transition as the intensity is varied at constant pulse duration. For C60, there are also different regimes of behavior as a function of pulse intensity. At low intensity, various optically-active modes are observed. At high intensity, the breathing moode is by far the most dominant. At still higher intensities, there is photofragmentation, with the evolution of dinmers and other products. These results were all obtained in simulation-. using tight-binding electron-ion dyanamics (TED).

Response of semiconductors and fullerenes to ultrashort and ultra-intense laser pulses Conference Paper