Results 91 to 100 of about 71,268 (259)
physica status solidi (b), EarlyView.Vacancies in low‐dose ion‐implanted GaN are studied by positron annihilation. Depth profiles of the net donor concentration (ND) are close to those for implanted impurities, but ND is 2–3 times higher than concentrations of implanted ions. The origin of donor‐like defects is expected to be N‐vacancy‐related defects, and Ga‐vacancy‐type defects play a ...
Akira Uedono +6 more
wiley +1 more source
Opportunities and Challenges of Using Feynman Diagrams with Upper Secondary Students [PDF]
, 2022 Merten Nikolay Dahlkemper +4 more
openalex +1 more source
Automatic computation of Feynman diagrams [PDF]
Progress in Particle and Nuclear Physics, 1999 Latex, 62 pages. Typos corrected, references updated and some comments added. Vertical offset changed. The complete paper is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp98/ttp98-41/ or via www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/
Harlander, Robert, Steinhauser, Matthias
openaire +2 more sources
physica status solidi (b), EarlyView.The response of graphene and MoS2 monolayers to highly‐charged impinging ions is investigated using nonequilibrium Green functions theory. Electronic correlations are found to have a significantly stronger influence on the ultrafast ion‐induced electron dynamics in MoS2 than in graphene.
Giorgio Lovato +4 more
wiley +1 more source
Labelled tree graphs, Feynman diagrams and disk integrals
Journal of High Energy Physics, 2017 In this note, we introduce and study a new class of “half integrands” in Cachazo-He-Yuan (CHY) formula, which naturally generalize the so-called Parke-Taylor factors; these are dubbed Cayley functions as each of them corresponds to a labelled tree graph.
Xiangrui Gao, Song He, Yong Zhang
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Optimized Copper Distribution and Enhanced Coercivity in PrO2‐Doped Sm2Co17‐Type Magnets
Rare Metals, EarlyView.ABSTRACT A rational design of Cu distribution is crucial for achieving optimal magnetic properties in Sm2Co17‐type magnets. In this study, nanostructured PrO2 powders were employed to induce Cu redistribution at grain boundaries while preserving the cellular microstructure. The corresponding coercivity (Hcj), remanence (Br), and maximum energy product (
Qi‐Qi Yang +5 more
wiley +1 more source
Integrable Feynman graphs and Yangian symmetry on the loom
Journal of High Energy PhysicsWe present significant evidence that the powerful property of Yangian invariance extends to a new large class of conformally invariant Feynman integrals. Our results apply to planar Feynman diagrams in any spacetime dimension dual to an arbitrary network
Vladimir Kazakov +2 more
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Rare Metals, EarlyView.ABSTRACT Transition metal carbides demonstrate exceptional mechanical properties but confront a critical hardness–toughness trade‐off. Spinodal decomposition‐mediated phase separation is an effective approach to enhance mechanical properties in carbide ceramics through high‐temperature treatment.
Zhi‐Xuan Zhang +6 more
wiley +1 more source
Tunnelling amplitudes through localised external potentials from Feynman diagram summation
European Physical Journal C: Particles and FieldsCurrently there is no general theory of quantum tunnelling of a particle through a potential barrier which is compatible with QFT. We present a complete calculation of tunnelling amplitudes for a scalar field for some simple potentials using quantum ...
Rosemary Zielinski +2 more
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d-dimensional SYK, AdS loops, and 6j symbols
Journal of High Energy Physics, 2019 We study the 6j symbol for the conformal group, and its appearance in three seemingly unrelated contexts: the SYK model, conformal representation theory, and perturbative amplitudes in AdS.
Junyu Liu +3 more
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