Friday, December 21, 2012

1212.4841 (Michael Sentef et al.)

Understanding quantum decoherence pathways using time-resolved

Michael Sentef, Alexander F. Kemper, Brian Moritz, James K. Freericks, Zhi-Xun Shen, Thomas P. Devereaux
In condensed matter physics, nonequilibrium pump-probe time domain spectroscopies have become an important tool to disentangle degrees of freedom whose coupling leads to broad structures in the frequency domain. Here, using the time-resolved solution of a model photoexcited electron-phonon system we show that the relaxational dynamics are governed by the equilibrium self-energy so that the phonon frequency sets a window for "slow" versus "fast" recovery. The overall temporal structure of this relaxation spectroscopy allows for a reliable and quantitative extraction of the electron-phonon coupling strength without resorting to an effective temperature model.
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