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The University of Southampton
Interdisciplinary Research Excellence

What is wrong with density functional theory? Event

Time:
16:00 - 17:00
Date:
20 May 2011
Venue:
Building 58, Room 1007

Event details

Electronic-structure modeling has become a very powerful tool to understand, predict, or design the properties of complex materials and devices. It is also an imperfect tool, with many open and urgent challenges in our quest towards qualitative and quantitative accuracy, and in our ability to perform quantum simulations under realistic conditions. Several of these challenges stem from the remnants of self-interaction in our electronic-structure framework, leading to qualitative failures in describing e.g. mixed-valence complexes, electron-transfer excitations, and even single-particle energies. I’ll discuss these effects in realistic case studies, and suggest possible solutions based on constrained density functional theory (DFT), on extended Hubbard functionals, or on imposing a generalized Koopmans’ condition. I’ll also highlight how the calculation of magnetic properties (NMR/EPR) or the use of wavefunction techniques can provide stringent validation criteria for novel developments.

http://cmg.soton.ac.uk/events/event-257/

Professor Nicola Marzari

Complex Systems Simulation Seminar Series (CS^4)

from the Institute for Complex Systems Simulation, the Complexity in Real-World Contexts USRG, the Computational Modelling Group and the Computational Systems Chemistry section (School of Chemistry).

Abstract

Electronic-structure modeling has become a very powerful tool to understand, predict, or design the properties of complex materials and devices. It is also an imperfect tool, with many open and urgent challenges in our quest towards qualitative and quantitative accuracy, and in our ability to perform quantum simulations under realistic conditions.

Several of these challenges stem from the remnants of self-interaction in our electronic-structure framework, leading to qualitative failures in describing e.g. mixed-valence complexes, electron-transfer excitations, and even single-particle energies. I'll discuss these effects in realistic case studies, and suggest possible solutions based on constrained density functional theory (DFT), on extended Hubbard functionals, or on imposing a generalized Koopmans' condition. I'll also highlight how the calculation of magnetic properties (NMR/EPR) or the use of wavefunction techniques can provide stringent validation criteria for novel developments.

http://mml.materials.ox.ac.uk/Main/ProfNicolaMarzari

Refreshments

Available from 3:30pm, lecture starts at 4pm.

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