Abstract
The transmission of the electron across the single normal metal–graphene (NG) and normal-metal–graphene–normal-metal (NGN) junctions has been investigated. For the single NG junction, the profile of the maximum transmission bears similarity to that of the conductance of the system and the minor effect of the incidence energy on transmission is found in conductance of the single NG junction. Concerning with NGN junction, the increase of strain strength always induces more resonance peaks at different angles in transmission and can therefore enhance the conductance. The increase of length of the middle graphene segment can accommodate more quasi-resonance states, leading to the more resonance peaks and richer structures in transmission. In both single NG and NGN junctions, the increase of the wavefunction period on metal side(s) can be observed due to the enhancement of strain strength, which can serve as the sensor for the detection of the strain strength in graphene.
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