Realization of Kagome Kondo lattice.

The Kondo lattice, describing a grid of the local magnetic moments coupling to itinerant electrons, is a fertile ground of strongly correlated states in condensed matter physics. While the Kagome lattice has long been predicted to host Kondo physics with exotic magnetism and nontrivial topology, no experimental realization has been achieved to the best of our knowledge. Here, we report the discovery of CsCrSb, a van der Waals-like Kagome Kondo lattice featuring extremely flat, isolated bands at the Fermi level that composed entirely of Cr-3d electrons.

Giant Second Harmonic Generation by Photoinduced Phase Engineering.

Addressing the growing demand for ever-shrinking nonlinear optical devices requires a paradigm shift to two-dimensional (2D) materials to bypass phase-matching limitations encountered in bulk crystals. While strategies like strain, electrical gating, and surface decoration have been explored to enhance the nonlinear susceptibility of 2D materials, the potential of laser-driven effects, with its exceptional controllability and accessibility, remains largely underexplored. Here, we demonstrate an optical approach to achieve a giant second-order parametric response in a metastable noncentrosymmetric 1M-WS by selectively controlling laser pulse duration.

Dynamic-to-static switch of hydrogen bonds induces a metal-insulator transition in an organic-inorganic superlattice.

Hydrogen bonds profoundly influence the fundamental chemical, physical and biological properties of molecules and materials. Owing to their relatively weaker interactions compared to other chemical bonds, hydrogen bonds alone are generally insufficient to induce substantial changes in electrical properties, thus imposing severe constraints on their applications in related devices. Here we report a metal-insulator transition controlled by hydrogen bonds for an organic-inorganic (1,3-diaminopropane)SnSe superlattice that exhibits a colossal on-off ratio of 10 in electrical resistivity.

Anomalous enhancement of charge density wave in kagome superconductor CsVSb approaching the 2D limit.

The recently discovered kagome metals AVSb (A = Cs, Rb, K) exhibit a variety of intriguing phenomena, such as a charge density wave (CDW) with time-reversal symmetry breaking and possible unconventional superconductivity. Here, we report a rare non-monotonic evolution of the CDW temperature (T) with the reduction of flake thickness approaching the atomic limit, and the superconducting transition temperature (T) features an inverse variation with T. T initially decreases to a minimum value of 72 K at 27 layers and then increases abruptly, reaching a record-high value of 120 K at 5 layers.