Energy dissipation from a correlated system driven out of equilibrium.

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ID: 101816
2016
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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 BiSrCaCuO 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.
Reference Key
rameau2016energynature Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Rameau, J D;Freutel, S;Kemper, A F;Sentef, M A;Freericks, J K;Avigo, I;Ligges, M;Rettig, L;Yoshida, Y;Eisaki, H;Schneeloch, J;Zhong, R D;Xu, Z J;Gu, G D;Johnson, P D;Bovensiepen, U;
Journal Nature communications
Year 2016
DOI
10.1038/ncomms13761
URL
Keywords
cuprates electron–phonon coupling insulator–metal transition ultrafast optics

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