نتایج جستجو برای: kohn

تعداد نتایج: 4530  

2006
Lawrence C. Evans LAWRENCE C. EVANS

This paper considers the p-Laplacian PDE for p = 1,∞ and some interesting new game theoretic interpretations, due to Kohn–Serfaty [K-S] and to Peres–Schramm–Sheffield–Wilson [P-S-S-W].

Journal: :Journal of chemical theory and computation 2009
Paola Gori-Giorgi Giovanni Vignale Michael Seidl

The exchange-correlation energy in Kohn-Sham density functional theory can be expressed exactly in terms of the change in the expectation of the electron-electron repulsion operator when, in the many-electron Hamiltonian, this same operator is multiplied by a real parameter λ varying between 0 (Kohn-Sham system) and 1 (physical system). In this process, usually called adiabatic connection, the ...

1997
Claudia Filippi C. J. Umrigar Xavier Gonze

We consider two perturbative schemes to calculate excitation energies, each employing the Kohn– Sham Hamiltonian as the unperturbed system. Using accurate exchange-correlation potentials generated from essentially exact densities and their exchange components determined by a recently proposed method, we evaluate energy differences between the ground state and excited states in first-order pertu...

2016
ANIL DAMLE LIN LIN

Localized representation of the Kohn-Sham subspace plays an important role in quantum chemistry and materials science. The recently developed selected columns of the density matrix (SCDM) method [J. Chem. Theory Comput. 11, 1463, 2015] is a simple and robust procedure for finding a localized representation of a set of Kohn-Sham orbitals from an insulating system. The SCDM method allows the dire...

Journal: :The Journal of chemical physics 2013
Magnus W D Hanson-Heine Michael W George Nicholas A Besley

The accuracy of excited states calculated with Kohn-Sham density functional theory using the maximum overlap method has been assessed for the calculation of adiabatic excitation energies, excited state structures, and excited state harmonic and anharmonic vibrational frequencies for open-shell singlet excited states. The computed Kohn-Sham adiabatic excitation energies are improved significantl...

2008
Jacob Sturm

Multiplier ideal sheaves are constructed as obstructions to the convergence of the Kähler-Ricci flow on Fano manifolds, following earlier constructions of Kohn, Siu, and Nadel, and using the recent estimates of Kolodziej and Perelman.

حسینی , سیدمحمد, هاشمی , سیده هلن, کمپانی , احمد,

  Electronic properties of CaTiO3 crystal in paraelectric and ferroelectric phases have been studied by first principles, using Hohenberg-Kohn-Sham density functional theory (DFT). In paraelectric phase the results show an indirect band gap of about 2eV at -R direction in the Brilluoin zone and a strong hybridization between Ti-3d an O-2P orbital. In ferroelectric phase a direct band gap of abo...

Journal: :Journal of Physical Chemistry Letters 2021

Using the Kohn–Sham density functional theory, we numerically study four-wave mixing response of a carbon atom model system exposed to train femtosecond two color ?–3? random phase coheren...

2008
Jacob Sturm

Multiplier ideal sheaves are constructed as obstructions to the convergence of the Kähler-Ricci flow on Fano manifolds, following earlier constructions of Kohn, Siu, and Nadel, and using the recent estimates of Kolodziej and Perelman.

2012
CARLOS ARGAEZ MICHAEL MELGAARD

We study the standard and extended Kohn-Shammodels for quasirelativistic N -electron Coulomb systems; that is, systems where the kinetic energy of the electrons is given by the quasi-relativistic operator

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