Matter systems condensation susceptibility

A group at Stanford studied second-order nonhnear susceptibility of the conduction band and valence band quantum well (QW) stractures extracted from the interference between second harmonic Adds of QWs and GaAs substrate as determined by the azimuthal dependence of the second harmonic power. This is the first demonstration of difference frequency generation of mid-lR in any QW. Groups at Stanford also studied vibrational dynamics in glass-forming liquids. These are the first vibrational photon echo experiments and first comprehensive temperature-dependent pump probe measurements on ar r condensed matter system. 

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