"Examining Electron-Boson Coupling Using Time-Resolved Spectroscopy"

Michael Sentef: Alexander F. Kemper, Brian Moritz, James K. Freericks, Zhi-Xun Shen and Thomas P. Devereaux; Physical Review X, 12/26/13.

Additional Authors: Alexander F. Kemper, Brian Moritz, James K. Freericks, Zhi-Xun Shen and Thomas P. Devereaux

Abstract:

Nonequilibrium pump-probe time-domain spectroscopies can 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 directly 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 requiring an effective temperature model or making strong assumptions about the underlying bare electronic band dispersion.