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As a typical material of two-dimensional semiconductor transition metal chalcogenides, MoS2 has excellent physical properties such as tunable band gap. Therefore, MoS2 moirésuperlattice is an ideal system for investigating the electron transport in condensed matter and the design of optoelectronic devices. On the other hand, interlayer conductance serves as a significant indicator for analyzing coupling effects in moiré superlattice. Here, in order to clarify the influence of tunable band gap on the interlayer conductance, we have developed a tunneling theory for calculating the interlayer conductance of MoS2 moiré superlattices by using optical methods in diffraction physics. In this theory, the electron tunneling can be considered as the diffraction of electron waves by the periodic gratings. Accordingly, the influences of the periodicity of MoS2 moiré superlattices and the coherence of the tunneling electrons can be well included in the theory. In addition, the effect of the tunable band gap of MoS2 is taken into account. Based on the theory, we have investigated the properties of the interlayer conductance of MoS2 moirésuperlattice. The theoretical results show that, due to the diffraction effect, there exist two partial waves of the tunneling electron at the interface which can resonate with the interface potential. Accordingly, the interlayer conductance curves exhibit a double-peak structure. Furthermore, we have analyzed the influences of the tunneling layer and the metal electrodes to the interlayer conductance: the thicknesses of the upper MoS2 lattice affects the peak and the lower one primarily influence the background. The coherence of tunneling electrons will be enhanced when the parameter of interface potential strength increases. The chemical potential of the metal electrode mainly influences the properties of the peak, and the influence is more significant than that in graphite moirésuperlattice.
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Keywords:
- MoS2 moiré superlattice /
- tunneling conductance /
- diffraction physics /
- twistronics
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