Many ionocovalent oxide materials are either semiconducting or insulating in nature.One of the most im- portant quantities characterising these materials,therefore,is the bandgap energy.The thermodynamic ap- proaches ...Many ionocovalent oxide materials are either semiconducting or insulating in nature.One of the most im- portant quantities characterising these materials,therefore,is the bandgap energy.The thermodynamic ap- proaches to the bandgaps of oxides are briefly described and some interracial phenomena with oxides are pres- ented.The standard electrode potentials of oxide electrodes and the heterogeneous catalytic behaviours of the oxides as well as the wetting and adhesion in liquid metal/oxide systems can be closely related to the bandgap energies of the oxides.The interfacial phenomena involving the ionocovalent oxides are associated with the electronic processes.展开更多
Introducing superconductivity into two-dimensional(2D)films with nontrivial topology has been intensively pursued as one of the feasible scenarios to realize 1D topological superconductor.Prevailing endeavors mostly e...Introducing superconductivity into two-dimensional(2D)films with nontrivial topology has been intensively pursued as one of the feasible scenarios to realize 1D topological superconductor.Prevailing endeavors mostly exploit the external gating or proximity effect of a traditional superconductor,by which the critical temperatures(T_(c))are limited to several Kelvin range.Here,we report on the discovery of interface-enhanced superconductivity in monolayer 1T'-MoTe_(2) film.A thermally driven phase transition from Mo_(6)Te_(6) nanowires to 1T'-MoTe_(2) films,grown on SrTiO_(3)(001)surface by the molecular beam epitaxial methods,is demonstrated.A combined study of scanning tunneling microscopy/spectroscopy,electrical transport and magnetization measurements indicates the T_(c) of MoTe_(2) film is around 30 K,two orders of magnitude larger than its 3D counterpart crystal.This study shows that interfacial engineering is an efficient way to tune monolayer 1T'-MoTe_(2) film into superconducting states,and thus may pave the way toward higher-T_(c) 1D intrinsic topological superconductivity.展开更多
文摘Many ionocovalent oxide materials are either semiconducting or insulating in nature.One of the most im- portant quantities characterising these materials,therefore,is the bandgap energy.The thermodynamic ap- proaches to the bandgaps of oxides are briefly described and some interracial phenomena with oxides are pres- ented.The standard electrode potentials of oxide electrodes and the heterogeneous catalytic behaviours of the oxides as well as the wetting and adhesion in liquid metal/oxide systems can be closely related to the bandgap energies of the oxides.The interfacial phenomena involving the ionocovalent oxides are associated with the electronic processes.
基金funding provided by Shanghai Jiao Tong UniversityNational Natural Science Foundation of China(Grants No.11790313,No.92065201,No.11874256,No.11874258,No.12074247,No.12174252 and No.11861161003)+3 种基金the Ministry of Science and Technology of China(Grants No.2019YFA0308600,2020YFA0309000)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB28000000)the Science and Technology Commission of Shanghai Municipality(Grants No.2019SHZDZX01,No.19JC1412701,No.20QA1405100)for financial supportfinancial support from Innovation program for Quantum Science and Technology(Grant No.2021ZD0302500).
文摘Introducing superconductivity into two-dimensional(2D)films with nontrivial topology has been intensively pursued as one of the feasible scenarios to realize 1D topological superconductor.Prevailing endeavors mostly exploit the external gating or proximity effect of a traditional superconductor,by which the critical temperatures(T_(c))are limited to several Kelvin range.Here,we report on the discovery of interface-enhanced superconductivity in monolayer 1T'-MoTe_(2) film.A thermally driven phase transition from Mo_(6)Te_(6) nanowires to 1T'-MoTe_(2) films,grown on SrTiO_(3)(001)surface by the molecular beam epitaxial methods,is demonstrated.A combined study of scanning tunneling microscopy/spectroscopy,electrical transport and magnetization measurements indicates the T_(c) of MoTe_(2) film is around 30 K,two orders of magnitude larger than its 3D counterpart crystal.This study shows that interfacial engineering is an efficient way to tune monolayer 1T'-MoTe_(2) film into superconducting states,and thus may pave the way toward higher-T_(c) 1D intrinsic topological superconductivity.
