9 papers
The principle of detailed balance between electrons and phonons in presence of excitonic effects
Alberto Guandalini, Giovanni Caldarelli, Francesco Mauri +1
Based on a many-body formulation, we derive an electron-phonon coupling including excitonic effects that preserves thermodynamic detailed balance between electronic and phononic sc…
Electronic transport in BN-encasulated graphene limited by remote phonon scattering
Khalid Dinar, Francesco Macheda, Alberto Guandalini +6
We study the impact of BN's phonons on the electrical resistivity of hBN-encapsulated graphene. While encapsulation yields high-mobility devices, the surrounding BN itself introduc…
Ultraviolet optical conductivity, exciton fine-structure and dispersion of freestanding monolayer h-BN
Jinhua Hong, Alberto Guandalini, Weibin Wu +7
Excitons govern the light-matter interaction in 2D gapped materials with intrinsically large binding energies. In spite of plentiful optical measurements in the visible for semicon…
Efficient GW calculations for metals from an accurate ab initio polarizability
Giacomo Sesti, Alberto Guandalini, Andrea Ferretti +4
Despite its success in the study of spectroscopic properties, the method presents specific methodological challenges when applied to systems with metallic screening. Here, we…
Excitonic effects in phonons: reshaping the graphene Kohn anomalies and lifetimes
Alberto Guandalini, Francesco Macheda, Giovanni Caldarelli +1
We develop an ab initio framework that captures the impact of electron-electron and electron-hole interactions on phonon properties. This enables the inclusion of excitonic effects…
High- and low-energy many-body effects of graphene in a unified approach
Alberto Guandalini, Giovanni Caldarelli, Francesco Macheda +1
We show that the many-body features of graphene band structure and electronic response can be accurately evaluated by applying many-body perturbation theory to a tight-binding (TB)…