Speaker | Andrea Ferretti |
Affiliation | S3 CNR NANO, Modena, Italy |
Date | 2019-03-27 |
Time | 15:00 |
Venue | S3 Seminar Room, Third Floor, Physics Building, FIM Department |
Host | Massimo Rontani |
Energy functionals which depend explicitly on each individual orbital density, rather than the total charge density, appear naturally when applying self-interaction corrections to density-functional theory. Rather than a limitation, we argue that this is a powerful feature, and show how it is possible to interpret the orbital-dependency of densities and potentials as an effective frequency dependency. Such a frame is naturally amenable to describe electronic spectroscopies [1], and is free from e.g. the constraint of having derivative discontinuities in the exact formulation. Excellent agreement is achieved for ionization potentials and affinities, fundamental gaps, and deeper orbital levels (photoemission) for both molecules and solids [2-4].
We believe that a functional theory for the spectral density is therefore emerging, able to address at the same time total energies and spectral properties. In this talk I'll give an overview of the basic formulation of the spectral density functional theory (SDFT) framework, and show how the Koopmans compliance construction can be seen as an approximation (or practical realization) of it.
[1] A. Ferretti, I. Dabo, M. Cococcioni, N. Marzari, Phys. Rev. B 89, 195134 (2014).
[2] N.-L. Nguyen, G. Borghi, A. Ferretti, I. Dabo, N. Marzari, Phys. Rev. Lett. 114, 166405 (2015).
[3] N. Colonna, A. Ferretti, N.-L. Nguyen, N. Marzari, J. Chem. Theory Comput. 14, 2549 (2018).
[4] N.-L. Nguyen, N. Colonna, A. Ferretti, N. Marzari, Phys. Rev. X 8, 021051 (2018).
Massimo Rontani - massimo.rontani@nano.cnr.it
Istituto Nanoscienze
Consiglio Nazionale delle Ricerche
PEC: protocollo.nano@pec.cnr.it
Partita IVA 02118311006
Piazza San Silvestro 12
56127 Pisa, Italy
phone +39 050 509418
fax +39 050 509550
Istituto Nanoscienze Consiglio Nazionale delle Ricerche
Piazza San Silvestro 12, I
56127 Pisa
phone +39 050 509525/418
fax +39 050 509550
via Campi 213/A, I
41125 Modena 7
phone +39 059 2055629
fax +39 059 2055651″
Cookie | Duration | Description |
---|---|---|
cookielawinfo-checkbox-analytics | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics". |
cookielawinfo-checkbox-functional | 11 months | The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". |
cookielawinfo-checkbox-necessary | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary". |
cookielawinfo-checkbox-others | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. |
cookielawinfo-checkbox-performance | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance". |
viewed_cookie_policy | 11 months | The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data. |