We introduce the notion of electronic enthalpy for first-principles structural and dynamical calculations of finite systems under pressure. An external pressure field is allowed to act directly on the electronic structure of the system studied via the ground-state minimization of the functional E+PVq, where V-q is the quantum volume enclosed by a charge isosurface. The Hellmann-Feynman theorem applies, and assures that the ionic equations of motion follow an isoenthalpic dynamics. No pressurizing medium is explicitly required, while coatings of environmental ions or ligands can be introduced if chemically relevant. We apply this novel approach to the study of group-IV nanoparticles during a shock wave, highlighting the significant differences in the plastic or elastic response of the diamond cage under load, and their potential use as novel nanostructured impact-absorbing materials.

Electronic-enthalpy functional for finite systems under pressure / Cococcioni, M; Mauri, F; Ceder, G; Marzari, N. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 94:14(2005). [10.1103/PhysRevLett.94.145501]

Electronic-enthalpy functional for finite systems under pressure

Mauri, F;Marzari, N
2005

Abstract

We introduce the notion of electronic enthalpy for first-principles structural and dynamical calculations of finite systems under pressure. An external pressure field is allowed to act directly on the electronic structure of the system studied via the ground-state minimization of the functional E+PVq, where V-q is the quantum volume enclosed by a charge isosurface. The Hellmann-Feynman theorem applies, and assures that the ionic equations of motion follow an isoenthalpic dynamics. No pressurizing medium is explicitly required, while coatings of environmental ions or ligands can be introduced if chemically relevant. We apply this novel approach to the study of group-IV nanoparticles during a shock wave, highlighting the significant differences in the plastic or elastic response of the diamond cage under load, and their potential use as novel nanostructured impact-absorbing materials.
2005
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01 Pubblicazione su rivista::01a Articolo in rivista
Electronic-enthalpy functional for finite systems under pressure / Cococcioni, M; Mauri, F; Ceder, G; Marzari, N. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 94:14(2005). [10.1103/PhysRevLett.94.145501]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1337050
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