Luminescence and Covalency in Ytterbium-Doped CrX (X = Cl, Br, I) van der Waals Compounds.

The layered 2D van der Waals ferromagnets CrX (X = Cl, Br, I) show broad d-d photoluminescence (PL). Here we report preparation, structural characterization, and spectroscopic studies of all three CrX compounds doped with the optical impurity, Yb. EXAFS measurements show very similar Cr K-edge and Yb L-edge data for each doped compound, and good fits of the latter are obtained for structures having Yb occupying substitutional octahedral sites.

Magnetic Amplification at Yb "Designer Defects" in the van der Waals Ferromagnet CrI.

The two-dimensional (2D) van der Waals ferromagnet CrI has been doped with the magnetic optical impurity Yb to yield materials that display sharp multiline Yb photoluminescence (PL) controlled by the magnetism of CrI. Magneto-PL shows that Yb magnetization is pinned to the magnetization of CrI. An effective internal field of ∼10 T at Yb is estimated, attributed to strong in-plane Yb-Cr superexchange coupling.

Ferromagnetism and Spin-Polarized Luminescence in Lead-Free CsEuCl Perovskite Nanocrystals and Thin Films.

The emergence of next-generation spintronic and spin-photonic technologies will be aided by the development of materials showing strongly coupled magnetic, electronic, and optical properties. Through a combination of magneto-photoluminescence and magnetic circular dichroism spectroscopies we demonstrate strong magneto-optical responses from CsEuCl perovskite nanocrystals and thin films in the near-UV/visible region, stemming from the transitions centered at the B-site Eu cations. We show that this material undergoes a ferromagnetic phase transition at ∼3 K in both the nanocrystal and thin-film samples, resulting in complete spin alignment and indicating intrinsic ferromagnetism.

A Broad Spectrum Protein Glycosylation System Influences Type II Protein Secretion and Associated Phenotypes in .

Protein secretion plays a crucial role for bacterial pathogens, exemplified by facultative human-pathogen , which secretes various proteinaceous effectors at different stages of its lifecycle. Accordingly, the identification of factors impacting on protein secretion is important to understand the bacterial pathophysiology. PglL, a predicted oligosaccharyltransferase of , has been recently shown to exhibit -glycosylation activity with relaxed glycan specificity in an engineered system.