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- Hedin, Lars, et al.
(författare)
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Local exchange-correlation potentials
- 1971
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Ingår i: Solid State Communications. - : Elsevier BV. - 1879-2766 .- 0038-1098. ; 9:9, s. 537-541
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Tidskriftsartikel (refereegranskat)abstract
- Recent advances in the many-body theory of electrons in solids and in the theory of the interacting electron gas are used to construct explicit local effective potentials which incorporate the effects of correlation and exchange. For ground state properties we consider the scheme by Hohenberg, Kohn and Sham and provide data for the effective potential μxc. For excitation energies the corresponding potential Vxc is obtained from the self-energy of an electron gas and numerical data are provided for the construction of Vxc.
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| 4. |
- Hedin, Lars, et al.
(författare)
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New structure in the single-particle spectrum of an electron gas
- 1967
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Ingår i: Solid State Communications. - : Elsevier BV. - 1879-2766 .- 0038-1098. ; 5:4, s. 237-239
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Tidskriftsartikel (refereegranskat)abstract
- Calculations of the one-electron Green's function give a single-particle spectrum where, besides the usual quasi-particles, a new peak of appreciable strength appears which corresponds to an electron coupled to real plasmons.
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| 5. |
- Hedin, Lars, et al.
(författare)
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On the single-particle spectrum of an interacting electron gas
- 1967
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Ingår i: [Host publication title missing]. - : Wiley. ; 1, s. 237-237
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Konferensbidrag (refereegranskat)abstract
- n the many-body theory of conduction electrons in a metal the single-particle spectrum is described not simply by the energy versus momentum relation as in band theory but by a function that describes the actual shape of the spectrum for a given momentum and has an appreciable spread in energy. Calculations of the spectral strength function for electrons in a uniform electron gas are described, where, besides the usual quasi-particle peak and a broad background, a new peak of appreciable strength appears for small momenta. The new excitation corresponds to a coupled mode of an electron and real plasmons. It has a strong effect on the energy distribution of electrons in the system. The effects should show up only in certain types of experiments that depend on the energy spectrum in the region where the new mode occurs.
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| 6. |
- Hedin, Lars, et al.
(författare)
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Effects of Electron-Electron and Electron-Phonon Interactions on the One-Electron States of Solids
- 1969
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Ingår i: Solid State Physics. - 9780126077230 ; 23, s. 1-181
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Bokkapitel (refereegranskat)abstract
- Publisher Summary: This chapter discusses two major developments that have taken place over the past decade. First is the enormous wealth of energy band calculations that have had tremendous success in explaining the properties of specific solids, but in which the connection with first principles is not always apparent. Second is the spectacular progress of many-body theory applied to the solid state that has given a number of new results, although often of a rather general and formal nature, such as to provide the justification and a formal basis for a one-electron theory. The electron gas problem is treated in some detail here. The problem of the crystal potential is given due attention. It discusses the potential from the ion cores as well as from the valence electrons, and suggests schemes that incorporate essential exchange and correlation effects for the valence electrons. An energy band calculation that properly includes the effects of exchange and correlation describes the elementary excitations called quasi particles. Quasi-particle properties are usually discussed using the remarkable Landau theory of the Fermi liquid. This chapter gives a brief presentation of the theory and reviews the present status of calculations of the Fermi liquid parameters and how they are determined from experiments.
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| 7. |
- Hedin, Lars, et al.
(författare)
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ON LOCAL DENSITY SCHEMES
- 1972
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Ingår i: Le Journale de Physique Colloques. ; C3:5-6, s. 73-81
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Konferensbidrag (refereegranskat)abstract
- This paper summarizes recent results how to obtain approximate one-electron potentials describing exchange and correlation which depend on the local electron density. Following the lines given by Hohenberg, Kohn and Sham explicit results are given in two versions of the theory; one to describe ground state properties and one for excitation energies. The extension to spin polarized systems is discussed and some new results are presented. The paper also summarizes recent results about the linear response properties and comments on the role of the non-locality of the self-energy.
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