Energy dissipation from a correlated system driven out of equilibrium

J. D. Rameau (), S. Freutel, A. F. Kemper (), M. A. Sentef, J. K. Freericks, I. Avigo, M. Ligges, L. Rettig, Y. Yoshida, H. Eisaki, J. Schneeloch, R. D. Zhong, Z. J. Xu, G. D. Gu, P. D. Johnson and U. Bovensiepen
Additional contact information
J. D. Rameau: Brookhaven National Laboratory, Brookhaven National Laboratory
S. Freutel: Faculty of Physics and Center for Nanointegration Duisburg-Essen (Cenide), University Duisburg-Essen
A. F. Kemper: North Carolina State University
M. A. Sentef: HISKP, University of Bonn
J. K. Freericks: Georgetown University
I. Avigo: Faculty of Physics and Center for Nanointegration Duisburg-Essen (Cenide), University Duisburg-Essen
M. Ligges: Faculty of Physics and Center for Nanointegration Duisburg-Essen (Cenide), University Duisburg-Essen
L. Rettig: Faculty of Physics and Center for Nanointegration Duisburg-Essen (Cenide), University Duisburg-Essen
Y. Yoshida: National Institute of Advanced Industrial Science and Technology
H. Eisaki: National Institute of Advanced Industrial Science and Technology
J. Schneeloch: Brookhaven National Laboratory, Brookhaven National Laboratory
R. D. Zhong: Brookhaven National Laboratory, Brookhaven National Laboratory
Z. J. Xu: Brookhaven National Laboratory, Brookhaven National Laboratory
G. D. Gu: Brookhaven National Laboratory, Brookhaven National Laboratory
P. D. Johnson: Brookhaven National Laboratory, Brookhaven National Laboratory
U. Bovensiepen: Faculty of Physics and Center for Nanointegration Duisburg-Essen (Cenide), University Duisburg-Essen

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: 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 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.

Date: 2016
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DOI: 10.1038/ncomms13761

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