Laser-Induced Above-Bandgap Transparency in GaAs

Details Laser-Induced Above-Bandgap Transparency in GaAs Laser-Induced Above-Bandgap Transparency in GaAs

2004-03-20

arxiv.org/abs/cond-mat/0403528v1

Phys. Rev. Lett. 93, 157401 (2004)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.157401

We report the observation of large ($\sim 40%$) laser-induced above-bandgap transparency in GaAs at room temperature. The induced transparency is present only during the pulse width of the driving midinfrard laser pulses and its spectral shape is consistent with a laser-induced blue shift of the band edge. Our simulations based on the dynamic Franz-Keldysh effect reproduce the salient features of the experimental results, demonstrating in particular that the amount of the band edge shift is approximately given by the ponderomtive potential.

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