Excitonic Dynamical Franz-Keldysh Effect

Excitonic Dynamical Franz-Keldysh Effect

Dynamical Franz-Keldysh effect.

Attosecond dynamical Franz-Keldysh effect in polycrystalline diamond.

Short, intense laser pulses can be used to access the transition regime between classical and quantum optical responses in dielectrics. In this regime, the relative roles of inter- and intraband light-driven electronic transitions remain uncertain. We applied attosecond transient absorption spectroscopy to investigate the interaction between polycrystalline diamond and a few-femtosecond infrare...

Piezoelectric Franz–Keldysh effect in strained GaInN/GaN heterostructures

Pseudomorphic Ga12xInxN/GaN single heterostructures in the composition range 0,x,0.2 have been investigated by photoreflectance and photoluminescence spectroscopy. Strong Franz–Keldysh oscillations near the band gap of the ternary film are observed and attributed to a large constant piezoelectric field of up to 0.63 MV/cm. This allows an accurate determination of the electric field. A significa...

Photorefractive quantum wells: transverse Franz-Keldysh geometry

The photorefractive properties of semi-insulating AlGaAs-GaAs multiple quantum wells are described for the transverse Franz-Keldysh geometry with the electric field in the plane of the quantum wells. Combining the strong electroabsorption of quantum-confined excitons with the high resistivity of semi-insulating quantum wells yields large nonlinear optical sensitivities. The photorefractive quan...