Energy dissipation from a correlated system driven out of equilibrium

Rameau, J.D.; Freutel, S.; Kemper, A. F.; Sentef, Michael A.; Freericks, J. K.; Avigo, I.; Ligges, M.; Rettig, Laurenz; Yoshida, Y.; Eisaki, H.; Schneeloch, J.; Zhong, R. D.; Xu, Z. J.; Gu, G. D.; Johnson, P. D.; Bovensiepen, Uwe

doi:10.1038/ncomms13761

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Energy dissipation from a correlated system driven out of equilibrium

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Rettig, Laurenz
Faculty of Physics and Center for Nanointegration Duisburg-Essen (Cenide), University Duisburg-Essen;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Rameau, J., 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: https://hdl.handle.net/11858/00-001M-0000-002D-7BC3-7

Abstract

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 Bi₂Sr₂CaCu₂O_8+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.