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physica status solidi (b), ISSN 0370-1972, 07/2019, Volume 256, Issue 7, pp. 1800573 - n/a
Here, an algorithm to efficiently compute the second‐Born self‐energy of many‐body perturbation theory is described. The core idea consists in dissecting the... 
second‐Born self‐energy | nonequilibrium Green's functions | numerical algorithm | second-Born self-energy | PHYSICS, CONDENSED MATTER | GREEN-FUNCTIONS | Surgery | Analysis | Algorithms
Journal Article
Reviews of Modern Physics, ISSN 0034-6861, 11/2012, Volume 84, Issue 4, pp. 1527 - 1605
Journal Article
Physical Review B - Condensed Matter and Materials Physics, ISSN 1098-0121, 05/2014, Volume 89, Issue 20
We present experimental evidence for differences in surface energy losses between (a) electrons entering a solid from vacuum and (b) electrons leaving the... 
BEAM | PHYSICS, CONDENSED MATTER | SPECTROSCOPY | SELF-ENERGY
Journal Article
Nuclear Physics, Section A, ISSN 0375-9474, 02/2017, Volume 958, pp. 48 - 70
The spectral function of the Λ hyperon in finite nuclei is calculated from the corresponding Λ self-energy, which is constructed within a perturbative... 
YN interaction | Spectral function | Hypernuclei | Self-energy | Correlations | G-matrix
Journal Article
Journal of Mathematical Physics, ISSN 0022-2488, 2015, Volume 56, Issue 7, p. 72303
We present the result for the finite part of the two-loop sunrise integral with unequal masses in four space-time dimensions in terms of the O(epsilon(0))-part... 
GRAPH | DIAGRAMS | FEYNMAN-INTEGRALS | DIFFERENTIAL-EQUATIONS | ARBITRARY MASSES | NUMERICAL EVALUATION | AMPLITUDES | MASTER INTEGRALS | PHYSICS, MATHEMATICAL | SELF-ENERGIES
Journal Article
Journal of Chemical Theory and Computation, ISSN 1549-9618, 06/2015, Volume 11, Issue 6, pp. 2680 - 2696
Journal Article
Physical Review B - Condensed Matter and Materials Physics, ISSN 1098-0121, 2006, Volume 74, Issue 3
Algorithmic details and results of fully frequency-dependent G(0)W(0) calculations are presented. The implementation relies on the spectral representation of... 
AUGMENTED-WAVE METHOD | ELECTRONIC-PROPERTIES | PSEUDOPOTENTIALS | PHYSICS, CONDENSED MATTER | RESPONSE FUNCTIONS | APPROXIMATION | SEMICONDUCTORS | SOLIDS | PARTICLE BAND-STRUCTURE | SPACE-TIME METHOD | SELF-ENERGY
Journal Article
Physical Review Letters, ISSN 0031-9007, 12/2010, Volume 105, Issue 26, p. 266802
We present a broadly applicable, physically motivated, first-principles approach to determining the fundamental gap of finite systems from single-electron... 
APPROXIMATION | PHYSICS, MULTIDISCIPLINARY | ORBITAL ENERGIES | BAND-GAPS | DERIVATIVE DISCONTINUITIES | ABSORPTION-SPECTRA | OPTICAL GAPS | DENSITY-FUNCTIONAL THEORY | EXCHANGE | SELF-ENERGY | RANGE
Journal Article
Physical Review Letters, ISSN 0031-9007, 11/2012, Volume 109, Issue 18, p. 186404
We introduce density matrix embedding theory (DMET), a quantum embedding theory for computing frequency-independent quantities, such as ground-state... 
MONTE-CARLO | ZERO-TEMPERATURE | RENORMALIZATION-GROUP | QUANTUM IMPURITY MODELS | PHYSICS, MULTIDISCIPLINARY | MOTT TRANSITION | INFINITE DIMENSIONS | FERMIONS | SYSTEMS | HUBBARD-MODEL | SELF-ENERGY | Physics - Strongly Correlated Electrons
Journal Article
Physics Letters B, ISSN 0370-2693, 08/2019, Volume 795, pp. 432 - 437
We consider the 1s Lamb shift in hydrogen and helium ions, a quantity, required for an accurate determination of the Rydberg constant and the proton charge... 
ASTRONOMY & ASTROPHYSICS | SIZE | LIGHT-SCATTERING | ENERGY-LEVELS | PHYSICS, NUCLEAR | BINDING | SELF-ENERGY | PHYSICS, PARTICLES & FIELDS | Hydrogen
Journal Article
Journal of Mathematical Physics, ISSN 0022-2488, 10/2014, Volume 55, Issue 10, p. 102301
We present the two-loop sunrise integral with arbitrary non-zero masses in two space-time dimensions in terms of elliptic dilogarithms. We find that the... 
DIAGRAMS | DIFFERENTIAL-EQUATIONS | NUMERICAL EVALUATION | AMPLITUDES | MASTER INTEGRALS | PHYSICS, MATHEMATICAL | SELF-ENERGIES | Spacetime | Sunrise
Journal Article