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Quantum conductance of armchair carbon nanocoils: roles of geometry effects 被引量:3

Quantum conductance of armchair carbon nanocoils: roles of geometry effects
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摘要 Armchair carbon nanocoils (CNCs) with different geometric parameters are constructed and optimized using a tight-binding (TB) total energy model. The quantum conductance of these nanocoils is simulated employing a π-orbital TB model incorporated with the non-equilibrium Green's function theory. Compared with the perfect armchair carbon nanotubes (CNTs) and armchair CNTs with only Stone-Wales (SW) defects, the quantum conductance spectra of the armchair CNCs present distinct gaps around the Fermi level, which are mainly originated from the existence of sp3 carbon in the three-dimensional spiral structures. Moreover, the detailed conductance spectra of the armchair CNCs depend sensitively on their geometric parameters, such as tubular diameter and block-block distance. Armchair carbon nanocoils (CNCs) with different geometric parameters are constructed and optimized using a tight-binding (TB) total energy model. The quantum conductance of these nanocoils is simulated employing a γ-orbital TB model incorpo- rated with the non-equilibrium Green's function theory. Compared with the perfect armchair carbon nanotubes (CNTs) and armchair CNTs with only Stone-Wales (SW) defects, the quantum conductance spectra of the armchair CNCs present distinct gaps around the Fermi level, which are mainly originated from the existence of sp3 carbon in the three-dimensional spiral structures. Moreover, the detailed conductance spectra of the armchair CNCs depend sensitively on their geometric parameters, such as tubular diameter and block-block distance.
出处 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第5期841-845,共5页 中国科学:物理学、力学、天文学(英文版)
基金 supported by the Fundamental Research Funds for the Central Universities of China (Grant No. DUT10ZD211) the National Natural Science Foundation of China (Grant Nos. 51072027 and 40874039)
关键词 armchair carbon nanocoil quantum conductance tight-binding model non-equilibrium Green's function 碳纳米管 扶手 电导 几何效应 量子 格林函数理论 能量模型 几何参数
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