Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 37, Pages 18845-18850Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp405318b
Keywords
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Funding
- National Natural Science Foundation in China [11074182, 91121021, 11247276, 11274238]
- Qing Lan Project
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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The electron transport between two zigzag graphene nanoribbons (ZGNRs) connected by carbon atomic chains has been investigated by the nonequilibrium Green's function method combined with the density functional theory. The symmetry of the orbitals in the carbon chain critically selects the modes and energies of the transporting electrons. The electron transport near the Fermi energy can be well-manipulated by the position and the number of carbon chains contacting the nanoribbons. In symmetric ZGNRs connected by a central carbon chain, a square conductance step appears at the Fermi energy because the antisymmetric modes below it are not allowed to go through the chain. These modes can additionally contribute to the conductance if side carbon chains are added in the connection. By choosing a proper geometry configuration, we can realize Ohmic contact, current stabilizer, or the negative differential resistance phenomenon in the devices.
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