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hexagonal boron nitride excitons non linear optics bethe-salpter tddft eels electron phonon coupling non-linear optics many-body bse dynamical berry phase ab-initio luminescence optical properties high pressure hydrogen bethe-salpeter hbn bethe salpeter scipost open access journals two photon absorption phonon assisted luminescence non equilibrium green's functions density functional theory nonlinear optics attaccalite polarization second harmonic generation gw cnrs concour section 3 gw method linear response theory yambo code graphene quantum monte carlo real time pump and probe electron-hole double grid dynamical effects allen cardona doping exchange correlation functions fiesta pseudopotentials eletronic correlation third harmonic generation théorie et simulation numérique arxiv gruning time dependent density polarization theory hal publishers molecular dynamics shg pexcitons phonons exciton floquet real-time dynamics linear reponse dft material science strain h-bn variational monte carlo dmc diffusion monte carlo lanczos haydock 2d heterostructures scientific publishing pergamon elsevier electron loss spectroscopy 2d materials direct indirect band strucgture nature band gap exciton dispersion real-time simulation tdhartree real-time bethe salpeter equation screened hartree fock berry phase scientific journals open access academic publishing special issues excited states molecules green functions chemistry open science velocity gauge length gauge current current response rpa science ouverte tight binding ellipsometry electron-hole interactions density matrix ab initio solid state physics gdr-howdi