在碳纳米管的绳索中单电子运输
1M. Bockrath, D. H. Cobden, P. L. McEuen, N. G. Chopra, A. Zettl, Molecular Design Institute, Lawrence Berkeley National Laboratory, and Department of Physics, University of California, Berkeley, CA 94720, USA. A. Thess and R. E. Smalley, Center for Nanoscale Science and Technology, Rice Quantum Institute, and Departments of Chemistry and Physics, Mail Stop 100, Rice University, Post Office Box 1892, Houston, TX 77251, USA.
Science (New York, N.Y.)
|March 28, 1997
概括
研究人员测量了单壁碳纳米管绳的电特性. 在10克尔文以下,观察到抑制导电量和取决于门电压的峰值,表明单电子充电和共振道效应.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学是一种材料科学.
- 纳米技术纳米技术
背景情况:
- 单壁碳纳米管 (SWCNTs) 由于其纳米尺寸,具有独特的电气性能.
- 了解SWCNT捆中的电子运输对于开发新型电子设备至关重要.
- 预计量子效应,如库伦堡封锁,会影响低温下的运输特性.
研究的目的:
- 为了研究单壁碳纳米管 (SWCNTs) 的单个捆绑的低温电传输特性.
- 分析门电压对SWCNT绳索导电性的影响.
- 以基本量子力学原理来解释观察到的现象.
主要方法:
- 在基板上制造单个SWCNT绳子.
- 使用四探头技术进行低温电气测量.
- 可变低偏差电压扫描和门电压调制.
主要成果:
- 在应用电压低于几毫伏的情况下,观察到低于大约10克尔文的低偏移电导率.
- 作为应用门电压的函数,电导率的明显,显著的峰值.
- 门电压调制揭示了纳米管绳中电子占用率的离散变化.
结论:
- 观察到的抑制导电性归因于库伦阻塞,这是单电子充电效应的表现.
- 导电性峰值被解释为通过构成纳米管的量子化能量水平的共振道.
- 这些发现强调了在低温下SWCNT绳索中量子束和电子-电子相互作用的重要性.
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