19 citations · 31 across the 14 of their papers we have counts for
15 papers
Unified description of exciton, phonon and plasmon dispersions in 2D materials from an optical conductivity approximation
Alberto Guandalini, Andrea Ferretti, Daniele Varsano +2
The modified Coulomb interaction in two-dimensional (2D) materials gives rise to unique, non-analytic low-momentum dispersions of excitons, phonons, and plasmons. Here, we describe…
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…
A viable and accurate route to GW simulations of metals and doped semiconductors
Giacomo Sesti, Alberto Guandalini, Andrea Ferretti +4
In this work we present an efficient and fully ab-initio approach for the calculation of the screened Coulomb potential, specifically designed for two dimensional (2D) and three di…
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…
Variational formulation of dynamical electronic response functions in presence of nonlocal exchange interactions
Giovanni Caldarelli, Alberto Guandalini, Francesco Macheda +1
We consider the dynamical electronic response function in theoretical frameworks that include nonlocal exchange interactions, such as the Bethe-Salpeter equation with the frequency…
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)…
Direct observation of the vanishing EELS cross section in graphene
Alberto Guandalini, Ryosuke Senga, Yung-Chang Lin +5
In transmission electron energy-loss spectroscopy, the cross section in 2D is quenched by kinematic effects once the momentum transfer becomes smaller than a critical value set by…
Efficient GW calculations via the interpolation of the screened interaction in momentum and frequency space: The case of graphene
Alberto Guandalini, Dario A. Leon, Pino D'Amico +4
The GW self-energy may become computationally challenging to evaluate because of frequency and momentum convolutions. These difficulties were recently addressed by the development…
Excitonic effects in energy loss spectra of freestanding graphene
Alberto Guandalini, Ryosuke Senga, Yung-Chang Lin +8
In this work we perform electron energy-loss spectroscopy (EELS) of freestanding graphene with high energy and momentum resolution to disentangle the quasielastic scattering from t…
Efficient GW calculations in two dimensional materials through a stochastic integration of the screened potential
Alberto Guandalini, Pino D'Amico, Andrea Ferretti +1
Many-body perturbation theory methods, such as the approximation, are able to accurately predict quasiparticle (QP) properties of several classes of materials. However, th…
Density-functional approach to the band gaps of finite and periodic two-dimensional systems
Alberto Guandalini, Alice Ruini, Esa Räsänen +2
We present an approach based on density-functional theory for the calculation of fundamental gaps of both finite and periodic two-dimensional (2D) electronic systems. The computati…
Nonlinear Light Absorption in Many-Electron Systems Excited by an Instantaneous Electric Field: A Non-Perturbative Approach
Alberto Guandalini, Caterina Cocchi, Stefano Pittalis +2
We study light absorption in many-electron interacting systems beyond the linear regime by using a {\em single} broadband impulse of an electric field in the instantaneous limit. W…
Fundamental gaps of quantum dots on the cheap
Alberto Guandalini, Carlo Andrea Rozzi, Esa Räsänen +1
We show that the fundamental gaps of quantum dots can be accurately estimated at the computational effort of a standard ground-state calculation supplemented with a non self-consis…