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Chin. Phys. B, 2016, Vol. 25(12): 128503    DOI: 10.1088/1674-1056/25/12/128503
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

Low-bias negative differential conductance controlled by electrode separation

Xiao-Hua Yi(衣晓华), Ran Liu(刘然), Jun-Jie Bi(毕俊杰), Yang Jiao(焦扬), Chuan-Kui Wang(王传奎), Zong-Liang Li(李宗良)
School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
Abstract  

The electronic transport properties of a single thiolated arylethynylene molecule with 9,10-dihydroanthracene core, denoted as TADHA, is studied by using non-equilibrium Green's function formalism combined with ab initio calculations. The numerical results show that the TADHA molecule exhibits excellent negative differential conductance (NDC) behavior at lower bias regime as probed experimentally. The NDC behavior of TADHA molecule originates from the Stark effect of the applied bias voltage, by which the highest occupied molecular orbital (HOMO) and the HOMO-1 are pulled apart and become localized. The NDC behavior of TADHA molecular system is tunable by changing the electrode distance. Shortening the electrode separation can enhance the NDC effect which is attributed to the possible increase of coupling between the two branches of TADHA molecule.

Keywords:  molecular junctions      negative differential conductance      electrode distance  
Received:  27 July 2016      Revised:  01 September 2016      Accepted manuscript online: 
PACS:  85.65.+h (Molecular electronic devices)  
  73.63.-b (Electronic transport in nanoscale materials and structures)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant Nos. 11374195 and 11405098) and the Natural Science Foundation of Shandong Province, China (Grant No. ZR2013FM006).

Corresponding Authors:  Zong-Liang Li     E-mail:  lizongliang@sdnu.edu.cn

Cite this article: 

Xiao-Hua Yi(衣晓华), Ran Liu(刘然), Jun-Jie Bi(毕俊杰), Yang Jiao(焦扬), Chuan-Kui Wang(王传奎), Zong-Liang Li(李宗良) Low-bias negative differential conductance controlled by electrode separation 2016 Chin. Phys. B 25 128503

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