2D-XY ferromagnetism model is an important platform for the research of fundamental condensed matter physics. In this work, Dr. Kai Chang and colleagues have successfully grown nearly perfect monolayer CrCl3 films, and detected clear evidence of the underlying 2D-XY ferromagnetism. This study has solved the long-standing difficulty of reliable growth and measurement of 2D-XY ferromagnetic materials.

The mechanism of high-temperature superconductivity is one of the most challenging problems in condensed matter physics. It has remained unsettled for 35 years ever since Bednorz and Müller discovered high-temperature copper oxide (cuprate) superconductors in 1986. Consensuses are lacking even on some of its fundamental properties, such as the pairing symmetry.

Recently, a group of BAQIS researchers realized SnTe/PbTe monolayer lateral heterostructures and discovered both clockwise or counterclockwise vortex-oriented quadrant configurations of ferroelectric domains for the first time. This work, published online in Advanced Materials on July 3rd, 2021, could bring the application of two-dimensional (2D) in-plane ferroelectric heterostructures in nanoscale quantum devices one step closer.

Recently, the research team led by Prof. Qihua Xiong and their collaborators from Nanyang Technological University, Singapore have demonstrated the effective controllability of topological phases in a single perovskite exciton polariton lattice for the first time. This work is published in Science Advances entitled "Optical switching of topological phase in a perovskite polariton lattice".