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Optical Properties in Non-equilibrium Phase Transitions

By T Ao, Y Ping, K Widmann, D F Price, E Lee, H Tam, P T Springer and A Ng

Abstract

An open question about the dynamical behavior of materials is how phase transition occurs in highly non-equilibrium systems. One important class of study is the excitation of a solid by an ultrafast, intense laser. The preferential heating of electrons by the laser field gives rise to initial states dominated by hot electrons in a cold lattice. Using a femtosecond laser pump-probe approach, we have followed the temporal evolution of the optical properties of such a system. The results show interesting correlation to non-thermal melting and lattice disordering processes. They also reveal a liquid-plasma transition when the lattice energy density reaches a critical value

Topics: Optical Properties, Heating, 75 Condensed Matter Physics, Superconductivity And Superfluidity, 70 Plasma Physics And Fusion Technology, 36 Materials Science, Melting, 42 Engineering, 71 Classical And Quantum Mechanics, General Physics, Energy Density, Electrons, Excitation, Lasers
Publisher: Lawrence Livermore National Laboratory
Year: 2006
DOI identifier: 10.1103/physrevlett.96.055001
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Provided by: UNT Digital Library
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