<p>An innovative theoretical approach for deeper understanding of the
ultrafast spectroscopy experiments through solution of the Boltzmann transport
equation coupled with various nonlinear scattering mechanisms, overcoming the
limitations offered by DFT, RT-TDDFT and molecular based methods, is reported.
A clear advantage of the real-time approach is that it does not make a priori
assumptions about specific scattering, relaxation mechanisms and has
capabilities to capture the full real-time carrier’s dynamics, including the
superposition of all electron–electron, electron-lattice and electron–phonon
scatterings etc. No such method with advances in theoretical treatments to
explain ultrafast spectroscopy has been reported previously as per the author’s
knowledge.</p>