Mapping of unoccupied states and relevant bosonic modes via the time-dependent momentum distribution

A. F. Kemper, M. Sentef, B. Moritz, C. C. Kao, Z. X. Shen, J. K. Freericks, and T. P. Devereaux
Phys. Rev. B 87, 235139 – Published 28 June 2013

Abstract

The unoccupied states of complex materials are difficult to measure, yet they play a key role in determining their properties. We propose a technique that can measure the unoccupied states, called time-resolved Compton scattering, which measures the time-dependent momentum distribution (TDMD). Using a nonequilibrium Keldysh formalism, we study the TDMD for electrons coupled to a lattice in a pump-probe setup. We find a direct relation between temporal oscillations in the TDMD and the dispersion of the underlying unoccupied states, suggesting that both can be measured by time-resolved Compton scattering. We demonstrate the experimental feasibility by applying the method to a model of MgB2 with realistic material parameters.

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  • Received 15 August 2012

DOI:https://doi.org/10.1103/PhysRevB.87.235139

©2013 American Physical Society

Authors & Affiliations

A. F. Kemper1,2,*, M. Sentef2, B. Moritz2,3,4, C. C. Kao5, Z. X. Shen2,6, J. K. Freericks7, and T. P. Devereaux2,6

  • 1Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 3Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA
  • 4Department of Physics and Astrophysics, University of North Dakota, Grand Forks, North Dakota 58202, USA
  • 5Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 6Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
  • 7Department of Physics, Georgetown University, Washington, District of Columbia 20057, USA

  • *afkemper@lbl.gov

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Issue

Vol. 87, Iss. 23 — 15 June 2013

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