A tribute to pioneers of strongly coupled plasmas: Hugh E. DeWitt, Bernard Jancovici, and Forrest J. Rogers

Whitley, Heather D.; Alastuey, A.; Gaffney, Jim; Cauble, R.; Kraeft, W. D.; Bönitz, M.

doi:10.1002/ctpp.201400083

Cited by 4 publications

(3 citation statements)

References 65 publications

(59 reference statements)

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“…Subtraction of the Landau integral, I L , is necessary to avoid double counting of terms. The Landau integral corresponds to the static second-Born approximation (collision integrals of second order in the pair potential) which are contained (as the lowest iteration orders) in both, the T matrix and the dynamically screened potential, see [186] for a recent discussion and further references.…”

Section: Fluctuating-exchange Approximation (Flex)mentioning

confidence: 99%

Ultrafast dynamics of strongly correlated fermions—nonequilibrium Green functions and selfenergy approximations

Schluenzen

Hermanns

Scharnke

et al. 2019

J. Phys.: Condens. Matter

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This article presents an overview on recent progress in the theory of nonequilibrium Green functions (NEGF). We discuss applications of NEGF simulations to describe the femtosecond dynamics of various finite fermionic systems following an excitation out of equilibrium. This includes the expansion dynamics of ultracold atoms in optical lattices following a confinement quench and the excitation of strongly correlated electrons in a solid by the impact of a charged particle. NEGF, presently, are the only ab initio quantum approach that is able to study the dynamics of correlations for long times in two and three dimensions. However, until recently, NEGF simulations have mostly been performed with rather simple selfenergy approximations such as the second-order Born approximation (SOA). While they correctly capture the qualitative trends of the relaxation towards equilibrium, the reliability and accuracy of these NEGF simulations has remained open, for a long time. Here we report on recent tests of NEGF simulations for finite lattice systems against exact-diagonalization and density-matrix-renormalization-group benchmark data. The results confirm the high accuracy and predictive capability of NEGF simulations—provided selfenergies are used that go beyond the SOA and adequately include strong correlation and dynamical-screening effects. With an extended arsenal of selfenergies that can be used effectively, the NEGF approach has the potential of becoming a powerful simulation tool with broad areas of new applications including strongly correlated solids and ultracold atoms. The present review aims at making such applications possible. To this end we present a selfcontained introduction to the theory of NEGF and give an overview on recent numerical applications to compute the ultrafast relaxation dynamics of correlated fermions. In the second part we give a detailed introduction to selfenergies beyond the SOA. Important examples are the third-order approximation, the approximation, the T-matrix approximation and the fluctuating-exchange approximation. We give a comprehensive summary of the explicit selfenergy expressions for a variety of systems of practical relevance, starting from the most general expressions (general basis) and the Feynman diagrams, and including also the important cases of diagonal basis sets, the Hubbard model and the differences occuring for bosons and fermions. With these details, and information on the computational effort and scaling with the basis size and propagation duration, readers will be able to choose the proper basis set and straightforwardly implement and apply advanced selfenergy approximations to a broad class of systems.

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Section: Fluctuating-exchange Approximation (Flex)mentioning

confidence: 99%

Ultrafast dynamics of strongly correlated fermions—nonequilibrium Green functions and selfenergy approximations

Schluenzen

Hermanns

Scharnke

et al. 2019

J. Phys.: Condens. Matter

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“…The common interest in the theory of Green functions led to close contacts with colleagues in Prague. Contacts with colleagues in the West could be intensified after the fall of the Berlin Wall in 1989, for example, with Hugh E. DeWitt (Livermore), see Whitley et al, James A. McLennan (Bethlehem), and H. Sigurd Köhler (Tucson, USA), as well as with German colleagues, including Günter Ecker (Bochum), Friedrich Hensel (Marburg), Peter Mulser (Darmstadt), and Karl‐Heinz Spatschek (Düsseldorf). Many of these colleagues readily agreed to contribute to a special volume on the Contributions to Plasma Physics on the occasion of his 60th birthday in 1997.…”

Section: Scientific Lifementioning

confidence: 99%

A tribute to Dietrich Kremp

Bornath

Kraeft

Redmer

et al. 2017

Contrib. Plasma Phys

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“…The history of the present SCCS conferences started 40 years ago in June 1977 in Orleans la Source, where Gabor Kalman and Marc Feix organized the first SCCS Conference during June 7–10, 1977 . The present author remembers still the meetings in Orleans la Source attended by several pioneers in the field of strongly coupled plasmas, such as Claude Deutsch, Marc Feix, Marie‐Madelaine Gombert, Gabor Kalman, and Maurice Skowronek, and several prominent colleagues who already left us, such as Hugh De Witt, Forrest Rogers, and Bernard Jancovici (see Figure ). With Hugh de Witt and Forest Roger, the present author exchanged letters since the beginning of the 1970s, so the first SCCS conference was the first and unique chance to meet and exchange ideas.…”

Section: Introduction: From Orlean La Source 1977 To Kiel 2017mentioning

confidence: 97%

Max Planck and Albrecht Unsöld on plasma partition functions and lowering of ionization energy

Ébeling

2017

Contrib. Plasma Phys

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We summarize the work devoted to plasma thermodynamics and ionization theory performed by two protagonists working at Kiel University: Max Planck and Albrecht Unsöld. First we show that Planck developed, in Kiel, the basis for describing the chemical equilibria between charged particles (ions) and formulated later, in Berlin, the first complete version of the theory of ionization equilibria in plasmas with a convergent partition function. Abrecht Unsöld studied, in Kiel, the influence of plasma density on the atomic partition function, investigating the electric microfield between the ions. He showed that this effect leads to a lowering of the ionization energy going with the cubic root of the density. Finally, we discuss briefly recent theoretical and experimental work on the ionization potential depression.

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A tribute to pioneers of strongly coupled plasmas: Hugh E. DeWitt, Bernard Jancovici, and Forrest J. Rogers

Cited by 4 publications

References 65 publications

Ultrafast dynamics of strongly correlated fermions—nonequilibrium Green functions and selfenergy approximations

Ultrafast dynamics of strongly correlated fermions—nonequilibrium Green functions and selfenergy approximations

A tribute to Dietrich Kremp

Max Planck and Albrecht Unsöld on plasma partition functions and lowering of ionization energy

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