【摘 要】
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2H-and 1T-phase monolayer MoTe2 films on highly oriented pyrolytic graphite are studied using scanning tunneling microscopy and spectroscopy (STM/STS).The phase
【机 构】
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Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education), School of Physic
论文部分内容阅读
2H-and 1T-phase monolayer MoTe2 films on highly oriented pyrolytic graphite are studied using scanning tunneling microscopy and spectroscopy (STM/STS).The phase transition of MoTe2 can be controlled by a postgrowth annealing process,and the intermediate state during the phase transition is directly observed by STM.For 2H-MoTe2,inversion domain boundaries are presented as bright lines at high sample bias,but as dark lines at lower sample bias.The dI/dV mappings reveal the distinct distributions of electronic states between domain boundaries and interiors of domains.It should be noted that a 2 × 2 periodic structure is clearly disceable inside the domains,where the STS measurement shows a small dip of size ～150meV at the vicinity of the Fermi level,indicating that the 2 × 2 periodic structure may be an incommensurate charge density wave.Moreover,a 4 × 4 periodic structure appears in 2H-MoTe2 grown at a higher substrate temperature.
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