Electron transport in nanotube-ribbon hybrids |
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Authors: | T S Li S C Chang and M F Lin |
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Institution: | (1) Department of Electrical Engineering, Kun Shan University, Tainan, Taiwan, Republic of China;(2) Department of Physics, National Cheng Kung University, Tainan, Taiwan, Republic of China |
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Abstract: | The electronic and transport properties of nanotube-ribbon hybrids
subject to the influences of
a transverse electric field are investigated theoretically.
The energy dispersion relations are found to exhibit rich dependence on the
nanotube-ribbon interactions, the field strength, and the geometry of the hybrids.
The nanotube-ribbon coupling will
modify the subband curvature, create additional band-edge states, and
change the subband spacing or energy gap. The bandstructures are asymmetric and symmetric about the Fermi energy when the
interactions are turned on and off, respectively.
The inclusion of a transverse electric field will further alter
the bandstructures and lift the degeneracy of the partial
flat bands in hybrid (IV). The chemical-potential-dependent
electrical and thermal conductance exhibit a stepwise increase
behavior. Variations in the electronic structures with field
strength will be reflected in the electrical and thermal
conductance. Prominent peaks, as well as single-shoulder and
multi-shoulder structures in the electrical and thermal conductance
are predicted when varying the electric field strength and the
nanotube location. The features of the conductance are found to be
strongly dependent on the field strength, the geometry and the
temperature. |
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Keywords: | PACS" target="_blank">PACS 73 23 -b Electronic transport in mesoscopic systems 73 22 -f Electronic structure of nanoscale materials: clusters nanoparticles nanotubes and nanocrystals |
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