利用扫描隧道显微术、扫描隧道谱和密度泛函理论研究了茚并[1,2-b]芴-6,12-二酮(IFDO)在Au(111)表面形成的组装结构及其中分子轨道能级的变化.结果表明, IFDO在Au(111)表面通过分子间氢键沿鱼骨重构结构形成一维自组装分子链;位于组装...利用扫描隧道显微术、扫描隧道谱和密度泛函理论研究了茚并[1,2-b]芴-6,12-二酮(IFDO)在Au(111)表面形成的组装结构及其中分子轨道能级的变化.结果表明, IFDO在Au(111)表面通过分子间氢键沿鱼骨重构结构形成一维自组装分子链;位于组装结构中的分子的最低未占轨道相对孤立分子向费米能级方向发生0.16~0.32 e V的位移,且位移大小与分子同周围分子形成氢键的数目和方式有关.通过定量地对比不同氢键环境中分子的轨道能量位移与周围分子极化能大小的变化趋势,发现周围分子的瞬时极性是造成组装结构中IFDO分子轨道能量变化的主要因素.而周围分子的诱导极性则对缺陷结构处分子的轨道能级有不可忽略的影响.实验测得的IFDO分子轨道的能量变化来自于周围分子各向异性的瞬时极性和诱导极性的共同作用.展开更多
Depositing magnetic insulators on graphene has been a promising route to introduce magnetism via exchange proximity interaction in graphene for future spintronics applications.Molecule-based magnets may offer unique o...Depositing magnetic insulators on graphene has been a promising route to introduce magnetism via exchange proximity interaction in graphene for future spintronics applications.Molecule-based magnets may offer unique opportunities because of their synthesis versatility.Here,we investigate the magnetic proximity effect of epitaxial iron phthalocyanine(FePc)molecules on high-quality monolayer and bilayer graphene devices on hexagonal boron nitride substrates by probing the local and nonlocal transport.Although the FePc molecules introduce large hole doping effects combined with mobility degradation,the magnetic proximity gives rise to a canted antiferromagnetic state under a magnetic field in the monolayer graphene.On bilayer graphene and FePc heterostructure devices,the nonlocal transport reveals a pronounced Zeeman spin-Hall effect.Further analysis of the scattering mechanism in the bilayer shows a dominated long-range scattering.Our findings in graphene/organic magnetic insulator heterostructure provide a new insight for use of molecule-based magnets in two-dimensional spintronic devices.展开更多
文摘利用扫描隧道显微术、扫描隧道谱和密度泛函理论研究了茚并[1,2-b]芴-6,12-二酮(IFDO)在Au(111)表面形成的组装结构及其中分子轨道能级的变化.结果表明, IFDO在Au(111)表面通过分子间氢键沿鱼骨重构结构形成一维自组装分子链;位于组装结构中的分子的最低未占轨道相对孤立分子向费米能级方向发生0.16~0.32 e V的位移,且位移大小与分子同周围分子形成氢键的数目和方式有关.通过定量地对比不同氢键环境中分子的轨道能量位移与周围分子极化能大小的变化趋势,发现周围分子的瞬时极性是造成组装结构中IFDO分子轨道能量变化的主要因素.而周围分子的诱导极性则对缺陷结构处分子的轨道能级有不可忽略的影响.实验测得的IFDO分子轨道的能量变化来自于周围分子各向异性的瞬时极性和诱导极性的共同作用.
基金the National Natural Science Foundation of China(Grant No.11674150)the Key-Area Research and Development Program of Guangdong Province(Grant No.2019B010931001)+2 种基金the Guangdong Innovative and Entrepreneurial Research Team Program(Grant No.2016ZT06D348)the SUSTech CRFthe Hong Kong RGC(Grant Nos.16300617 and C6012-17E)。
文摘Depositing magnetic insulators on graphene has been a promising route to introduce magnetism via exchange proximity interaction in graphene for future spintronics applications.Molecule-based magnets may offer unique opportunities because of their synthesis versatility.Here,we investigate the magnetic proximity effect of epitaxial iron phthalocyanine(FePc)molecules on high-quality monolayer and bilayer graphene devices on hexagonal boron nitride substrates by probing the local and nonlocal transport.Although the FePc molecules introduce large hole doping effects combined with mobility degradation,the magnetic proximity gives rise to a canted antiferromagnetic state under a magnetic field in the monolayer graphene.On bilayer graphene and FePc heterostructure devices,the nonlocal transport reveals a pronounced Zeeman spin-Hall effect.Further analysis of the scattering mechanism in the bilayer shows a dominated long-range scattering.Our findings in graphene/organic magnetic insulator heterostructure provide a new insight for use of molecule-based magnets in two-dimensional spintronic devices.
