Local control of a single nitrogen-vacancy center by nanoscale engineered magnetic domain wall motions

Effective control and readout of qubits form the technical foundation of next-generation, transformative quantum information sciences and technologies. The nitrogen-vacancy (NV) center, an intrinsic three-level spin system, is naturally relevant in this context due to its excellent quantum coherence, high fidelity of operations, and remarkable functionality over a broad range of experimental conditions. It is an active contender for the development and implementation of cutting-edge quantum technologies. Here, we report magnetic domain wall motion driven local control and measurements of NV spin properties. By engineering the local magnetic field environment of an NV center via nanoscale reconfigurable domain wall motions, we show that NV photoluminescence, spin level energies, and coherence time can be reliably controlled and correlated to the magneto-transport response of a magnetic device. Our results highlight the electrically tunable dipole interaction between NV centers and nanoscale magnetic structures, providing an attractive platform to realize interactive information transfer between spin qubits and non-volatile magnetic memory in hybrid quantum spintronic systems.Comment: 13 pages, 5 figure

Identification of Cold-Responsive miRNAs and Their Target Genes in Nitrogen-Fixing Nodules of Soybean

As a warm climate species, soybean is highly sensitive to chilling temperatures. Exposure to chilling temperatures causes a significant reduction in the nitrogen fixation rate in soybean plants and subsequent yield loss. However, the molecular basis for the sensitivity of soybean to chilling is poorly understood. In this study, we identified cold-responsive miRNAs in nitrogen-fixing nodules of soybean. Upon chilling, the expression of gma-miR397a, gma-miR166u and gma-miR171p was greatly upregulated, whereas the expression of gma-miR169c, gma-miR159b, gma-miR319a/b and gma-miR5559 was significantly decreased. The target genes of these miRNAs were predicted and validated using 5' complementary DNA ends (5'-RACE) experiments, and qPCR analysis identified putative genes targeted by the cold-responsive miRNAs in response to chilling temperatures. Taken together, our results reveal that miRNAs may be involved in the protective mechanism against chilling injury in mature nodules of soybean

Novel hyperbranched resin for wood adhesive: Based on air oxidation and crosslinking copolymerization strategy

At present, environmentally friendly high-performance wood adhesives have received widespread attention. Glucose and tris(2-aminoethyl)amine (TAEA) were used as raw materials in this study. In the absence of catalysts, glucose-based wood adhesives with the hyperbranched crosslinking structure were prepared by the one-pot based on air oxidation and crosslinking copolymerization. The structures of the polymers were characterized by FT-IR, 13C NMR, LC-MS, and XPS. The results indicated that the interaction between glucose and TAEA is achieved through the dehydration reaction of carboxylic acid and primary amine, as well as the esterification reaction of carboxylic acid and alcohol. The hyperbranched polymer resin (GT) was successfully synthesized and used as a wood adhesive. The curing and thermal stability of GT adhesive were studied by DSC and TGA, and the results showed that GT had good thermal stability. The best-performing GT adhesive was screened by changing the molar ratio of tris(2-aminoethyl)amine/glucose and reaction time using the controlled variable method. The prepared GT adhesive has reached the national standard GB/T 17657-2013 (≥0.7 MPa) through the test of adhesive strength and water resistance. The dry shear strength of the plywood reached 1.97 MPa, and the strengths were 1.64 MPa and 1.31 MPa after immersion in hot and boiling water for 3 h. The experimental process is simple and green and the prepared hyperbranched glucose-based adhesive has excellent performance. Therefore, it has potential application prospects as a formaldehyde-free wood adhesive

Preparation a novel high performance glucose-based wood adhesive with hyperbranched cross-linked network by air oxidation

Utilizing biomass resources to develop environmentally friendly and sustainable adhesives, replacing traditional petroleum-based adhesives, has become an effective way to solve resource shortages and environmental pollution. Glucose, as the most widely distributed reducing monosaccharide in nature, has great potential to replace aldehyde-based adhesives in the production of artificial boards. In this study, G-PEI adhesive was prepared from glucose and PEI by one pot one-step method on the basis of air oxidation and Maillard reaction. The crosslinking mechanism between glucose and PEI was confirmed through detailed Fourier transform-infrared (FT-IR), 13C nuclear magnetic resonance (13C NMR), X-ray photoelectron spectroscopy (XPS), and liquid chromatography-mass spectrometry (LC-MS) analysis. The results showed that the improvement of G-PEI adhesive bonding properties was attributed to the formation of cross-linking network and the synergistic effect of covalent bond and hydrogen bond. As a biomass adhesive prepared without additional oxidant, the maximum wet strength in boiling water of wood-based panels prepared with G-PEI adhesive reaches 1.55 Mpa under the hot pressure condition of 200 °C. Even if the hot-pressing temperature drops to 160 °C, the wet shear strength in boiling water can still reach 0.67 MPa, which is better than relevant reports. This study revealed a method for the simple preparation of high performance wood adhesives by oxidizing glucose through air

Wide field imaging of van der Waals ferromagnet Fe3GeTe2 by spin defects in hexagonal boron nitride.

Emergent color centers with accessible spins hosted by van der Waals materials have attracted substantial interest in recent years due to their significant potential for implementing transformative quantum sensing technologies. Hexagonal boron nitride (hBN) is naturally relevant in this context due to its remarkable ease of integration into devices consisting of low-dimensional materials. Taking advantage of boron vacancy spin defects in hBN, we report nanoscale quantum imaging of low-dimensional ferromagnetism sustained in Fe3GeTe2/hBN van der Waals heterostructures. Exploiting spin relaxometry methods, we have further observed spatially varying magnetic fluctuations in the exfoliated Fe3GeTe2 flake, whose magnitude reaches a peak value around the Curie temperature. Our results demonstrate the capability of spin defects in hBN of investigating local magnetic properties of layered materials in an accessible and precise way, which can be extended readily to a broad range of miniaturized van der Waals heterostructure systems