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Dive into the research topics where Giorgia M. Lopez is active.

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Featured researches published by Giorgia M. Lopez.


Applied Physics Letters | 2006

Large fluorine-vacancy clusters in Si and their capture efficiency for self-interstitials

Giorgia M. Lopez; Vincenzo Fiorentini

Based on ab initio density-functional energetics for saturated (n=2m+2) fluorine-vacancy clusters FnVm for m up to 4, the authors set up a model showing that (a) fluorine-vacancy (F–V) aggregates in Si can form in any size and concentration for sufficient concentrations of incorporated (e.g., implanted) F, and (b) the F to V ratio in F–V complexes (i.e., the inverse capture efficiency of self-interstitials) is an ensemble average over many cluster sizes. It ranges between 4 and 2, with typical values of 2.2–2.5, consistent with recent experimental estimates.


Applied Physics Letters | 2004

Anomalous energetics and defect-assisted diffusion of Ga in silicon

Claudio Melis; Giorgia M. Lopez; Vincenzo Fiorentini

We study via first-principles calculations the energetics and diffusion of Ga in c-Si. In contrast to B and In, the favored Ga/self-interstitial complex is the tetrahedral interstitial GaT. Thus in the presence of self-interstitials Ga becomes interstitial, and is electrically deactivated as an acceptor. Studying the native-defect assisted diffusion, we find a self-interstitial-assisted mechanism to be favored; vacancy-assisted diffusion has a sizably larger activation energy, in agreement with the observed transient enhanced diffusion behavior.


Physical Review B | 2008

Chain metallicity and competition between paramagnetism and antiferromagnetism in underdoped YBa 2 Cu 3 O 6 + x : A first principles description

Alessio Filippetti; Giorgia M. Lopez; Mauro Mantega; Vincenzo Fiorentini

We describe from advanced first principles calculations the energetics of oxygen doping and its relation to insulator-metal transitions in underdoped YBa


Physical Review B | 2016

Anomalous scaling and breakdown of conventional denisty functional theory methods for the description of Mott phenomena and stretched bonds.

Zu-Jian Ying; Valentina Brosco; Giorgia M. Lopez; Daniele Varsano; Paola Gori-Giorgi; J. Lorenzana

_2


210th ECS Meeting | 2006

Electronic Structure Of Defects In Dielectrics With Electronic Correlation

Vincenzo Fiorentini; Alessio Filippetti; Giorgia M. Lopez

Cu


Physical Review B | 2005

Fluorine in Si: Native-defect complexes and the suppression of impurity diffusion

Giorgia M. Lopez; Vincenzo Fiorentini; G. Impellizzeri; S. Mirabella; E. Napolitani

_3


Physical Review B | 2004

Structure, energetics, and extrinsic levels of small self-interstitial clusters in silicon

Giorgia M. Lopez; Vincenzo Fiorentini

O


Physical Review B | 2010

First-principles calculation of electronic and structural properties of YBa2Cu3O6+y

Giorgia M. Lopez; Alessio Filippetti; Mauro Mantega; Vincenzo Fiorentini

_{6+x}


Physical Review Letters | 2006

Comment on "ab initio calculations to model anomalous fluorine behavior".

Vincenzo Fiorentini; Giorgia M. Lopez

. We find a strong tendency of doping oxygens to order into non-magnetic Cu


Physical Review B | 2005

Influence of point defects injection on the stability of a supersaturated Ga-Si solid solution

L. Romano; A.M. Piro; Maria Grazia Grimaldi; Giorgia M. Lopez; Vincenzo Fiorentini

^{1+}

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A.M. Piro

University of Catania

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Daniele Varsano

Sapienza University of Rome

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J. Lorenzana

Sapienza University of Rome

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L. Romano

University of Catania

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