| Helical Shell Structures of Ni-A1 Alloy Nanowires and Their Electronic Transport Properties |
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| 作者姓名： | 张学庆 李辉 刘锦茂 李云芳 孙丰伟 |
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| 作者单位： | [1]Department of Physics, Ocean University of China, Qingdao 266100 [2]Department of Building and Construction, City University of Hong Kong, Kowloon, Hong Kong |
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| 基金项目： | Supported by the New Century Excellent Talent Programme of the Ministry of Education of China under Grant No NCET- 05-0599, the National Natural Science Foundation of China under Grant No 50571093, and the Programme of Science and the Technology Bureau of Qingdao City under Grant Nos 05-1-NS-47 and 05-2-HY-46. |
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| 摘 要： | Six kinds of Ni-A1 alloy nanowires are optimized by means of simulated annealing. The optimized structures show that the Ni-A1 alloy nanowires are helical shell structures that are wound by three atomic strands, which is very similar to the case with pure metallic nanowires. The densities of states （DOS）, transmission function T（ E）, current-voltage （I - V） curves, and the conductance spectra of these alloy nanowires are also investigated. Our results indicate that the conductance spectra depend on the geometric structure properties and the ingredients of the alloy nanowires. We observe and study the nonlinear contribution to the I-V characteristics that are due to the quantum size effect and the impurity effect. The addition of Ni atoms decreases the conductance of the Ni-A1 alloy nanowire because the doping atom Ni change the electronic band structures and the charge density distribution. The interesting statistical results shed light on the physics of quantum transport at the nano-scale.
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| 关 键 词： | 螺旋外部结构 镍铝合金 纳米导线 电子传输 |
| 收稿时间： | 2007-3-16 |
| 修稿时间： | 2007-03-16 |
Helical Shell Structures of Ni--Al Alloy Nanowires and Their Electronic Transport Properties |
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| ZHANG Xue-Qing,LI Hui,LIEW Kim-Meow,LI Yun-Fang,SUN Feng-Wei.Helical Shell Structures of Ni-A1 Alloy Nanowires and Their Electronic Transport Properties[J].Chinese Physics Letters,2007,24(6):1701-1704. |
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| Authors: | ZHANG Xue-Qing LI Hui LIEW Kim-Meow LI Yun-Fang SUN Feng-Wei |
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| Affiliation: | Department of Physics, Ocean University of China, Qingdao 266100Department of Building and Construction, City University of Hong Kong, Kowloon, Hong Kong |
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| Abstract: | Six kinds of Ni--Al alloy nanowires are optimized by means of simulated annealing. The optimized structures show that the Ni--Al alloy nanowires are helical shell structures that are wound by three atomic strands, which is very similar to the case with pure metallic nanowires. The densities of states (DOS), transmission function T(E), current--voltage (I-V) curves, and the conductance spectra of these alloy nanowires are also investigated. Our results indicate that the conductance spectra depend on the geometric structure properties and the ingredients of the alloy nanowires. We observe and study the nonlinear contribution to the I--V characteristics that are due to the quantum size effect and the impurity effect. The addition of Ni atoms decreases the conductance of the Ni--Al alloy nanowire because the doping atom Ni change the electronic band structures and the charge density distribution. The interesting statistical results shed light on the physics of quantum transport at the nano-scale. |
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| Keywords: | 73 21 Hb 73 63 -b 61 46 Fg |
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