Charge Density Wave States in 2H-MoTe$_{2}$ Revealed by Scanning Tunneling Microscopy
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Abstract
2H- and 1T$'$-phase monolayer MoTe$_{2}$ films on highly oriented pyrolytic graphite are studied using scanning tunneling microscopy and spectroscopy (STM/STS). The phase transition of MoTe$_{2}$ can be controlled by a post-growth annealing process, and the intermediate state during the phase transition is directly observed by STM. For 2H-MoTe$_{2}$, 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 $2\times2$ periodic structure is clearly discernable inside the domains, where the STS measurement shows a small dip of size $\sim$150 meV at the vicinity of the Fermi level, indicating that the $2\times2$ periodic structure may be an incommensurate charge density wave. Moreover, a $4\times4$ periodic structure appears in 2H-MoTe$_{2}$ grown at a higher substrate temperature. -
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References
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