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

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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Cited by in corpus (10)

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• Coherent Excitonic Quantum Beats in Time-Resolved Photoemission Measurements
• Excitons and carriers in transient absorption and time-resolved ARPES spectroscopy: an abinitio approach
• Electronic transport in molecular junctions: The generalized Kadanoff-Baym ansatz with initial contact and correlations
• What do the two times in two-time correlation functions mean for interpreting tr-ARPES?
• Ultrafast creation and melting of nonequilibrium excitonic condensates in bulk WSe${}_2$
• Excitonic Bloch equations from first principles
• Probing magnetic orbitals and Berry curvature with circular dichroism in resonant inelastic X-ray scattering
• Excitonic effects in the photocarriers dynamics of two-dimensional materials