Ultrafast Critical Dynamics of Ferroelectric Phase Transition in Pb$_{1-x}$Ge$_{x}$Te

Details Ultrafast Critical Dynamics of Ferroelectric Phase Transition in Pb$_{1-x}$Ge$_{x}$Te Ultrafast Critical Dynamics of Ferroelectric Phase Transition in Pb$_{1-x}$Ge$_{x}$Te

2006-12-14

arxiv.org/abs/cond-mat/0612347v2

Physical Review B 75, 012107 (2007)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, corrected typos, accepted for publication in Physical Review B

Scientific paper

10.1103/PhysRevB.75.012107

Transient responses of the electronic excitation and coherent soft phonon are investigated both above and below the ferroelectric phase transition temperature T$_{c}$ in Pb$_{1-x}$Ge$_{x}$Te by using an optical pump-probe technique. The coherent soft mode shows large red-shift and heavily over-damped decay as the temperature approaching T$_{c}$ from the low temperature side and the soft mode disappears above T$_{c}$. The transient electronic response exhibits an abrupt change across T$_{c}$. The critical behaviors of both the phononic and electronic dynamics are interpreted by the ferroelectric phase transition.

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