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Ghost Instabilities in Self-Interacting Vector Fields: The Problem with Proca Fields.
Phys Rev Lett
October 2022
Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA.
Massive vector fields feature in several areas of particle physics, e.g., as carriers of weak interactions, dark matter candidates, or an effective description of photons in a plasma.
View Article and Find Full Text PDFSelective Population of Edge States in a 2D Topological Band System.
Phys Rev Lett
December 2015
Department of Mathematics, Imperial College London, London SW7 2AZ, United Kingdom.
We consider a system of interacting spin-one atoms in a hexagonal lattice under the presence of a synthetic gauge field. Quenching the quadratic Zeeman field is shown to lead to a dynamical instability of the edge modes. This, in turn, leads to a spin current along the boundary of the system which grows exponentially fast in time following the quench.
View Article and Find Full Text PDFStructure of divalent cation-phosphatidic acid complexes as determined by 31P-NMR.
Biochim Biophys Acta
July 1984
A comparative study of the structure of various phosphatidic acid-divalent cation complexes has been completed using 31P solids NMR methods. These complexes had been implicated as important intermediates in the fusion of phospholipid vesicles and several pieces of evidence had suggested that differences in activity of various ions may stem from structural differences among the complexes. Solids NMR studies using spin one-half nuclei reflect structural properties of molecules through partial averaging of chemical shift tensors.
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