We present a comparative experimental and theoretical investigation of the two–dimensional charge-transfer gap in the strongly correlated material Sr2CuO2Cl2. We observe an Urbach behaviour in the absorption profile over a surprisingly wide range of energies and temperatures. We present a model that accounts for phonon scattering to infinite order and which allows us to explain the data accurat...

thin films of binary bi 0 -teo and bi 0 -v 0 systems were prepared by the thermal co-evaporation technique in a vacuum at room temperature. the optical absorption edge of these systems are studied in the wavelength of 200-800 nm using a perkin-elmer uv/vis spectrophotometer. it is found that the value of n=3/2 in the davis-mott equation is best fitted for the fundamental absorption edge for the...

It is proposed that superoscillations play an important role in the interferences which give rise to superluminal effects. To exemplify that, we consider a toy model which allows for a wave packet to travel, in zero time and negligible distortion a distance arbitrarily larger than the width of the wave packet. The peak is shown to result from a superoscillatory superposition at the tail. Simila...

background and aims. the correct relationship of the total mesiodistal width of the mandibular teeth to that of the maxillary teeth (bolton’s ratios) is among the main factors considered in obtaining an optimal occlusion. the present study was conducted to determining the bolton’s ratios before and after treatment in skeletal class i patients. materials and methods. in this descriptive analytic...

Curved magnetic architectures are key enablers of prospective devices with respect to size, functionality, and speed. By exploring geometry-governed interactions, curvilinear magnetism offers a number intriguing effects in curved wires films. The applicability the current micromagnetic theory requires that sample has constant width thickness, which does not correspond many cases specificity exp...

The spectral linewidth of a transversely excited pulsed CO2 laser is broadened at high working pressures. This phenomenon causes decrease in the upper-level lifetime such that pulse width significantly compressed. Although tail part pulses owns non-negligible proportion total energy, it has minor effects during interaction process between photons and materials due to its low amplitude. Thus, gr...