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Journal Article

Energy dissipation from a correlated system driven out of equilibrium


Sentef,  M. A.
HISKP, University of Bonn;
Center for Free Electron Laser Science;
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Rameau, J. D., Freutel, S., Kemper, A. F., Sentef, M. A., Freericks, J. K., Avigo, I., et al. (2016). Energy dissipation from a correlated system driven out of equilibrium. Nature Communications, 7: 13761. doi:10.1038/ncomms13761.

Cite as: http://hdl.handle.net/21.11116/0000-0001-8E7D-4
In complex materials various interactions have important roles in determining electronic properties. Angle-resolved photoelectron spectroscopy (ARPES) is used to study these processes by resolving the complex single-particle self-energy and quantifying how quantum interactions modify bare electronic states. However, ambiguities in the measurement of the real part of the self-energy and an intrinsic inability to disentangle various contributions to the imaginary part of the self-energy can leave the implications of such measurements open to debate. Here we employ a combined theoretical and experimental treatment of femtosecond time-resolved ARPES (tr-ARPES) show how population dynamics measured using tr-ARPES can be used to separate electron–boson interactions from electron–electron interactions. We demonstrate a quantitative analysis of a well-defined electron–boson interaction in the unoccupied spectrum of the cuprate Bi2Sr2CaCu2O8+x characterized by an excited population decay time that maps directly to a discrete component of the equilibrium self-energy not readily isolated by static ARPES experiments.