Zobrazeno 1 - 10
of 200
pro vyhledávání: '"Stefanucci, Gianluca"'
Autor:
Stefanucci, Gianluca, Perfetto, Enrico
The ultrafast conversion of coherent excitons into incoherent excitons, as well as the subsequent exciton diffusion and thermalization, are central topics in current scientific research due to their relevance in optoelectronics, photovoltaics and pho
Externí odkaz:
http://arxiv.org/abs/2407.17077
Autor:
Stefanucci, Gianluca, Perfetto, Enrico
In this paper we conclusively demonstrate that Density Functional Perturbation Theory calculations of phonon linewidths are not affected by overscreening issues. Additionally, we present an exact formula designed to incorporate nonadiabatic and corre
Externí odkaz:
http://arxiv.org/abs/2407.12285
Publikováno v:
npj 2D Mater Appl 8, 40 (2024)
The interaction of excitons with lattice vibrations underlies the scattering from bright to dark excitons as well as the coherent modulation of the exciton energy. Unlike the former mechanism, which involves phonons with finite momentum, the latter c
Externí odkaz:
http://arxiv.org/abs/2406.15221
Autor:
Stefanucci, Gianluca
The extraordinary quantum properties of nonequilibrium systems governed by dissipative dynamics have become a focal point in contemporary scientific inquiry. The Nonequilibrium Green's Functions (NEGF) theory provides a versatile method for addressin
Externí odkaz:
http://arxiv.org/abs/2402.10824
Autor:
Stefanucci, Gianluca, Perfetto, Enrico
Starting from the {\em ab initio} many-body theory of electrons and phonons, we go through a series of well defined simplifications to derive a set of coupled equations of motion for the electronic occupations and polarizations, nuclear displacements
Externí odkaz:
http://arxiv.org/abs/2311.03980
Autor:
Perfetto, Enrico, Stefanucci, Gianluca
Quantum simulations of photoexcited low-dimensional systems are pivotal for understanding how to functionalize and integrate novel two-dimensional (2D) materials in next-generation optoelectronic devices. First principles predictions are extremely ch
Externí odkaz:
http://arxiv.org/abs/2305.07458
Publikováno v:
Physical Review X 13, 031026 (2023)
We lay down the {\em ab initio} many-body quantum theory of electrons and phonons in- and out-of-equilibrium at any temperature. We begin by addressing a fundamental issue concerning the {\em ab initio} Hamiltonian in the harmonic approximation, whic
Externí odkaz:
http://arxiv.org/abs/2303.02102