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; U Bovensiepen

doi:10.1038/ncomms13761

Energy dissipation from a correlated system driven out of equilibrium

Nat Commun. 2016 Dec 20:7:13761. doi: 10.1038/ncomms13761.

Authors

J D Rameau¹, S Freutel², A F Kemper^{3

4}, M A Sentef^{5

6}, J K Freericks⁷, I Avigo², M Ligges², L Rettig², Y Yoshida⁸, H Eisaki⁸, J Schneeloch¹, R D Zhong¹, Z J Xu¹, G D Gu¹, P D Johnson¹, U Bovensiepen²

Affiliations

¹ Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, 734 Brookhaven Avenue, Upton, New York, 11973, USA.
² Faculty of Physics and Center for Nanointegration Duisburg-Essen (Cenide), University Duisburg-Essen, Lotharstrasse 1, Duisburg 47057, Germany.
³ Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA.
⁴ Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA.
⁵ HISKP, University of Bonn, Bonn 53115, Germany.
⁶ Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, Hamburg 22761, Germany.
⁷ Department of Physics, Georgetown University, Washington, District of Columbia 20057, USA.
⁸ National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.

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.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.
Research Support, Non-U.S. Gov't