岩层与地表移动的广义下沉公式

在考虑岩性差异的条件下,推导出了岩层与地表移动的广义下沉公式,最后列举了其应用意义和实例。     

Moiré superlattice modulations in single-unit-cell FeTe films grown on NbSe2 single crystals

Interface can be a fertile ground for exotic quantum states, including topological superconductivity, Majorana mode, fractal quantum Hall effect, unconventional superconductivity, Mott insulator, etc. Here we grow single-unit-cell (1UC) FeTe film on NbSe₂ single crystal by molecular beam epitaxy (MBE) and investigate the film in-situ with a home-made cryogenic scanning tunneling microscopy (STM) and non-contact atomic force microscopy (AFM) combined system. We find different stripe-like superlattice modulations on grown FeTe film with different misorientation angles with respect to NbSe₂ substrate. We show that these stripe-like superlattice modulations can be understood as moiré pattern forming between FeTe film and NbSe₂ substrate. Our results indicate that the interface between FeTe and NbSe₂ is atomically sharp. By STM-AFM combined measurement, we suggest that the moiré superlattice modulations have an electronic origin when the misorientation angle is relatively small (≤ 3°) and have structural relaxation when the misorientation angle is relatively large (≥ 10°).     

Experimental Observations Indicating the Topological Nature of the Edge States on HfTe_5

The topological edge states of two-dimensional topological insulators with large energy gaps furnish ideal conduction channels for dissipationless current transport. Transition metal tellurides X_(Te5)X=Zr, Hf) are theoretically predicted to be large-gap two-dimensional topological insulators, and the experimental observations of their bulk insulating gap and in-gap edge states have been reported, but the topological nature of these edge states still remains to be further elucidated. Here, we report our low-temperature scanning tunneling microscopy/spectroscopy study on single crystals of HfTe5. We demonstrate a full energy gap of ～80 meV near the Fermi level on the surface monolayer of HfTe5 and that such an insulating energy gap gets filled with finite energy states when measured at the monolayer step edges. Remarkably, such states are absent at the edges of a narrow monolayer strip of one-unit-cell in width but persist at both step edges of a unit-cell wide monolayer groove. These experimental observations strongly indicate that the edge states of HfTe5 monolayers are not trivially caused by translational symmetry breaking, instead they are topological in nature protected by the 2 D nontrivial bulk properties.     

四磺基苯基铁卟啉催化反应研究及分析应用

用金属-有机配位化合物四磺基苯基铁卟啉(Iron-(4-sulphophenyl)porphyrin,FeTPPS4)作为辣根过氧化物酶(Horeseradish Peroxidase,HRP)模拟酶,催化活化H2O2氧化染料氢供体底物孔雀绿(MG),建立了FeTPPS4/H2O2/MG新的模拟酶催化反应体系。用该体系测定H2O2的表观摩尔吸光系数ε为5.54×103L.mol-1.cm-1,检出限为3.61×10-6mol/L。拟定的方法用于雨水中H2O2的测定,并与葡萄糖氧化酶(Glucose Oxidase,GOD)反应偶联测定葡萄糖(Glu)含量,结果令人满意。