6 papers
Evidence of a two-dimensional nitrogen crystalline structure on silver surfaces
Xuegao Hu, Haijun Cao, Zhicheng Gao +11
Nitrogen, the most abundant element in Earth's atmosphere, exists as a diatomic gas under standard temperature and pressure. In the two-dimensional (2D) limit, atomically thin nitr…
Floquet-engineered Valley Topology with Anisotropic Response in 1T'-WSe and Janus WSeTe monolayers
Zhe Li, Haijun Cao, Lijuan Li +3
Valley topology has emerged as a key concept for realizing new classes of quantum states. Here, we investigate Floquet-engineered topological phase transitions in anisotropic 1T'-W…
Light-engineered Multichannel Quantum Anomalous Hall Effect in High-order Topological Plumbene
Zhe Li, Fangyang Zhan, Haijun Cao +3
Floquet engineering severs as a forceful technique for uncovering high Chern numbers of quantum anomalous Hall (QAH) states with feasible tunability in high-order topologically ins…
Laser-engineered -point Topology in Trigonal Bismuthene
Zhe Li, Haijun Cao, Sheng Meng
The -point topology represents a significant segment in the family of topological insulators. Here we provide a comprehensive prediction of light-induced -point-based topol…
Flat bands and temperature-driven phase transition in quasi-one-dimensional zigzag chains
Jisong Gao, Haijun Cao, Xuegao Hu +12
Flat-band materials have garnered extensive attention due to their captivating properties associated with strong correlation effects. While flat bands have been discovered in sever…
Evidence for Two-dimensional Weyl Fermions in Air-Stable Monolayer PtTe
Zhihao Cai, Haijun Cao, Haohao Sheng +14
The Weyl semimetals represent a distinct category of topological materials wherein the low-energy excitations appear as the long-sought Weyl fermions. Exotic transport and optical…