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

Author

Listed:
  • Davide Sangalli

    (European Theoretical Spectroscopy Facility (ETSF) and CNR-ISM, Division of Ultrafast Processes in Materials (FLASHit))

  • Enrico Perfetto

    (European Theoretical Spectroscopy Facility (ETSF) and CNR-ISM, Division of Ultrafast Processes in Materials (FLASHit))

  • Gianluca Stefanucci

    (Dipartimento di Fisica and European Theoretical Spectroscopy Facility (ETSF), Università di Roma Tor Vergata
    INFN, Sezione di Roma Tor Vergata)

  • Andrea Marini

    (European Theoretical Spectroscopy Facility (ETSF) and CNR-ISM, Division of Ultrafast Processes in Materials (FLASHit))

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.

Suggested Citation

  • Davide Sangalli & Enrico Perfetto & Gianluca Stefanucci & Andrea Marini, 2018. "An ab-initio approach to describe coherent and non-coherent exciton dynamics," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 91(8), pages 1-12, August.
    • Handle: RePEc:spr:eurphb:v:91:y:2018:i:8:d:10.1140_epjb_e2018-90126-5
    DOI: 10.1140/epjb/e2018-90126-5
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