Moirésystems have emerged as an ideal platform for exploring interaction effects and correlated states.However,most of the experimental systems are based on either triangular or honeycomb lattices.In this study,b...Moirésystems have emerged as an ideal platform for exploring interaction effects and correlated states.However,most of the experimental systems are based on either triangular or honeycomb lattices.In this study,based on the self-consistent Hartree–Fock calculation,we investigate the phase diagram of the kagomélattice in a recently discovered system with two degenerateΓvalley orbitals and strong spin–orbit coupling.By focusing on the filling factors of 1/2,1/3 and 2/3,we identify various symmetry-breaking states by adjusting the screening length and dielectric constant.At the half filling,we discover that the spin–orbit coupling induces Dzyaloshinskii–Moriya interaction and stabilizes a classical magnetic state with 120°ordering.Additionally,we observe a transition to a ferromagnetic state with out-of-plane ordering.In the case of 1/3 filling,the system is ferromagnetically ordered due to the lattice frustration.Furthermore,for 2/3 filling,the system exhibits a pinned droplet state and a 120°magnetic ordered state at weak and immediate coupling strengths,respectively.For the strong coupling case,when dealing with non-integer filling,the system is always charge ordered with sublattice polarization.Our study serves as a starting point for exploring the effects of correlation in moirékagomésystems.展开更多
The surface flashover is affected by many factors,such as surface roughness,nanofillers and chemical functional groups.In this research study,polyamide mesh was utilised as a scaffold to systematically study the syner...The surface flashover is affected by many factors,such as surface roughness,nanofillers and chemical functional groups.In this research study,polyamide mesh was utilised as a scaffold to systematically study the synergistic effect of micro structure/nanofiller/superhydrophobicity on the surface flashover.Based on the dissolution and resolidification method,nanofillers were partially embedded into the mesh fabrics.Here,Al_(2)O_(3)nanoparticles were used as a typical non-conductive nanofiller,and carbon nanotubes were used as a typical conductive nanofiller.Moreover,the micro structure was determined by altering the mesh size,and chemical fluorination was utilised to change the surface chemical group.It was found that the polyamide mesh with 300#demonstrated best anti-flashover properties.Chemical fluorination could effectively improve the flashover voltage.By further adjusting the ratio of Al_(2)O_(3)to carbon nanotubes,the flashover voltage can be increased by up to 30%.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12350404 and 12174066)the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302600)+1 种基金the National Key Research and Development Program of China(Grant No.2019YFA0308404)the Science and Technology Commission of Shanghai Municipality(Grant Nos.23JC1400600 and 2019SHZDZX01)。
文摘Moirésystems have emerged as an ideal platform for exploring interaction effects and correlated states.However,most of the experimental systems are based on either triangular or honeycomb lattices.In this study,based on the self-consistent Hartree–Fock calculation,we investigate the phase diagram of the kagomélattice in a recently discovered system with two degenerateΓvalley orbitals and strong spin–orbit coupling.By focusing on the filling factors of 1/2,1/3 and 2/3,we identify various symmetry-breaking states by adjusting the screening length and dielectric constant.At the half filling,we discover that the spin–orbit coupling induces Dzyaloshinskii–Moriya interaction and stabilizes a classical magnetic state with 120°ordering.Additionally,we observe a transition to a ferromagnetic state with out-of-plane ordering.In the case of 1/3 filling,the system is ferromagnetically ordered due to the lattice frustration.Furthermore,for 2/3 filling,the system exhibits a pinned droplet state and a 120°magnetic ordered state at weak and immediate coupling strengths,respectively.For the strong coupling case,when dealing with non-integer filling,the system is always charge ordered with sublattice polarization.Our study serves as a starting point for exploring the effects of correlation in moirékagomésystems.
基金National Nature Science Foundation of China,Grant/Award Numbers:51777076,51977079the Central Guidance on Local Science and Technology Development Fund of Hebei Province,Grant/Award Number:226Z1204G+2 种基金Key Laboratory of Icing and Anti/De-icing of CARDC,Grant/Award Number:IADL20210401the Top Young Innovative Talents of Colleges and Universities of Higher Learning Institutions of Hebei,Grant/Award Number:BJ2021095the Fundamental Research Funds for the Central Universities,Grant/Award Number:2020MS115。
文摘The surface flashover is affected by many factors,such as surface roughness,nanofillers and chemical functional groups.In this research study,polyamide mesh was utilised as a scaffold to systematically study the synergistic effect of micro structure/nanofiller/superhydrophobicity on the surface flashover.Based on the dissolution and resolidification method,nanofillers were partially embedded into the mesh fabrics.Here,Al_(2)O_(3)nanoparticles were used as a typical non-conductive nanofiller,and carbon nanotubes were used as a typical conductive nanofiller.Moreover,the micro structure was determined by altering the mesh size,and chemical fluorination was utilised to change the surface chemical group.It was found that the polyamide mesh with 300#demonstrated best anti-flashover properties.Chemical fluorination could effectively improve the flashover voltage.By further adjusting the ratio of Al_(2)O_(3)to carbon nanotubes,the flashover voltage can be increased by up to 30%.
