Examining Electron-Boson Coupling Using Time-Resolved Spectroscopy

oleh: Michael Sentef, Alexander F. Kemper, Brian Moritz, James K. Freericks, Zhi-Xun Shen, Thomas P. Devereaux

Format: Article
Diterbitkan: American Physical Society 2013-12-01

Deskripsi

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.