A model in which a gap forms in the renormalized electronic density of state (DOS) with missing states recovered just above the pseudogap ∆pg, is able to give a robust description of the striking, triangular like, peak seen in the real part of the optical self-energy of underdoped cuprates. We use this model to explore the effect of the pseudogap on the real part of the optical conductivity and...

We present an optical conductivity of EuB6 over a wide range 2 meV–5.5 eV from reflectivity and ellipsometry measurements. Upon the ferromagnetic transition at Tc=15.5 K, interband transition 1 decreases below =3.3 eV and the lost spectral weight is transferred to the Drude 1 at 0.33 eV. Further a high-energy optical peak at around 4 eV exhibits a large splitting below Tc. We explain these high...

The valence hole subbands, the TE and TM mode optical gains and radiative current density of In0.2Ga0.8As/GaAs compressively strained quantum well lasing at 980nm have been studied by using a 6x 6 Hamiltonian model including the heavy hole, light hole and spin-orbit splitting bands. The compressively strain enhances the TE mode optical gains and strongly depresses the TM mode optical gain. A ve...