title: Ab initio energy loss spectra of Si and Ge nanowires.
abstract: We report an ab initio investigation of fast electron energy-loss probability in silicon and germanium nanowires. Computed energy loss spectra are characterized by a strong enhancement of the direct interband transition peak at low energy, in good agreement with experimental data. Our calculations predict an important diameter dependence of the bulk volume plasmon peak for very thin wires which is consistent with the blue shift observed experimentally in thicker wires.
authors.affiliation: Dipartimento di Fisica e European Theoretical Spectroscopy Facility (ETSF), Universitá degli Studi di Roma "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Roma, Italy. maurizia.palummo@roma2.infn.it and INFN, Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044 Frascati, Italy.
authors.forename: Maurizia
authors.initials: M
authors.lastname: Palummo
authors.affiliation: Dipartimento di Fisica e European Theoretical Spectroscopy Facility (ETSF), Universitá degli Studi di Roma "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Roma, Italy. maurizia.palummo@roma2.infn.it and Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche (CNR-ISM), Via Fosso del Cavaliere 100, 00133 Roma, Italy.
authors.forename: Conor
authors.initials: C
authors.lastname: Hogan
authors.affiliation: Dipartimento di Scienze e Metodi dell'Ingegneria, Universitá di Modena e Reggio Emilia, via Amendola 2 Pad. Morselli, I-42100 Reggio Emilia, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Ossicini