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First-principles calculations are carried out to predict the structures and electronic properties of 2H- and Td-WTe2 nanoribbons with different termination edges. It is found that the 2H-WTe2 nanoribbon along the armchair direction and the Td-WTe2 nanoribbon along the X direction show semiconducting characters with tunable band gaps. The 2H-WTe2 nanoribbon along the zigzag direction and the Td-WTe...
We use a two-dimensional electrostatic model to explore Van der Pauw (VdP) method on samples with holes. Results of electrostatic simulation based on the model are consistent with the experimental results. The quantitative investigation of VdP method on sample with one hole indicate the value of f, i.e. the right hand side of VdP equation, is depend on the position of contacts and the size of holes...
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