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An ab-initio approach to describe coherent and non-coherent exciton dynamics

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Abstract

The use of ultra-short laser pulses to pump and probe materials activates a wealth of processes which involve the coherent and non coherent dynamics of interacting electrons out of equilibrium. Non equilibrium (NEQ) many body perturbation theory (MBPT) offers an equation of motion for the density–matrix of the system which well describes both coherent and non coherent processes. In the non correlated case there is a clear relation between these two regimes and the matrix elements of the density–matrix. The same is not true for the correlated case, where the potential binding of electrons and holes in excitonic states need to be considered. In the present work we discuss how NEQ-MBPT can be used to describe the dynamics of both coherent and non-coherent excitons in the low density regime. The approach presented is well suited for an ab initio implementation.

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Authors and Affiliations

  1. European Theoretical Spectroscopy Facility (ETSF) and CNR-ISM, Division of Ultrafast Processes in Materials (FLASHit), Area della Ricerca di Roma 1, Monterotondo Scalo, Italy

    Davide Sangalli, Enrico Perfetto & Andrea Marini

  2. Dipartimento di Fisica and European Theoretical Spectroscopy Facility (ETSF), Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133, Roma, Italy

    Gianluca Stefanucci

  3. INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133, Roma, Italy

    Gianluca Stefanucci

Authors
  1. Davide Sangalli
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  2. Enrico Perfetto
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  3. Gianluca Stefanucci
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  4. Andrea Marini
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Corresponding author

Correspondence to Davide Sangalli.

Additional information

Contribution to the Topical Issue “Special issue in honor of Hardy Gross”, edited by C.A. Ullrich, F.M.S. Nogueira, A. Rubio, and M.A.L. Marques.

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Sangalli, D., Perfetto, E., Stefanucci, G. et al. An ab-initio approach to describe coherent and non-coherent exciton dynamics. Eur. Phys. J. B 91, 171 (2018). https://doi.org/10.1140/epjb/e2018-90126-5

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  • DOI: https://doi.org/10.1140/epjb/e2018-90126-5

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