| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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A Silicon Cluster Based Single Electron Transistor with Potential Room-Temperature Switching |
| Zhanbin Bai1, Xiangkai Liu2, Zhen Lian3, Kangkang Zhang1, Guanghou Wang1, Su-Fei Shi3, Xiaodong Pi2, Fengqi Song1** |
1National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093
2State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027
3Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, NY 12180, USA
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| Cite this article: |
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Zhanbin Bai, Xiangkai Liu, Zhen Lian et al 2018 Chin. Phys. Lett. 35 037301 |
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Abstract We demonstrate the fabrication of a single electron transistor device based on a single ultra-small silicon quantum dot connected to a gold break junction with a nanometer scale separation. The gold break junction is created through a controllable electromigration process and the individual silicon quantum dot in the junction is determined to be a Si$_{170}$ cluster. Differential conductance as a function of the bias and gate voltage clearly shows the Coulomb diamond which confirms that the transport is dominated by a single silicon quantum dot. It is found that the charging energy can be as large as 300 meV, which is a result of the large capacitance of a small silicon quantum dot ($\sim$1.8 nm). This large Coulomb interaction can potentially enable a single electron transistor to work at room temperature. The level spacing of the excited state can be as large as 10 meV, which enables us to manipulate individual spin via an external magnetic field. The resulting Zeeman splitting is measured and the $g$ factor of 2.3 is obtained, suggesting relatively weak electron-electron interaction in the silicon quantum dot which is beneficial for spin coherence time.
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Received: 09 February 2018
Published: 25 February 2018
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| Fund: Supported by the National Key Research and Development Program of China under Grant No 2017YFA0303200, the National Natural Science Foundation of China under Grant Nos U1732273, U1732159, 91421109, 91622115, 11522432, 11574217 and 61774133, the Natural Science Foundation of Jiangsu Province under Grant No BK20160659. |
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