A couple of months ago we reported on an arXiv paper that reported superluminal pulse propagation. The paper was such a steaming pile of science that our report amounted to something along the lines ...

IN all smooth wave-guides and many loaded wave-guides the phase velocity has the same sign as the energy velocity. Some systems having complex forms of loading have in the past been attributed with ...

Fig. 1. Real part of the dielectric function of isopropanol (IPA) without optical excitation (black line) and with optical excitation leading to the three different electron concentrations of 50, 100 ...