Quantized current in carbon nanotube quantum dots by surface acoustic waves
Quantized current in carbon nanotube quantum dots by surface acoustic waves
复制标题
通过表面声波量化碳纳米管量子点中的电流
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
A. Wixforth
中科院分区：
文献类型：
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作者：
C. Würstle;J. Ebbecke;M. Regler;A. Wixforth
单电荷效应在作为未来晶体管结构或量子密码学的可能应用方面引起了人们的极大关注。本文研究了表面声波在碳纳米管(CNT)中形成的量子点中的单电荷传输。碳纳米管采用声学对准技术，在压电主衬底上连接金属源极和漏极触点。由于碳纳米管内部缺陷的存在，与纳米管接触的金属电极为准一维电子系统提供了隧道势垒，从而形成了几个串联的量子点。与表面波相关的动态压电场导致通过系统的声电电流，该电流被证明是量子化的，就像在旋转门装置中一样。
Single charge effects attract much attention with respect to possible applications as future transistor structures or for quantum cryptography. Here, surface acoustic wave mediated single charge transport through quantum dots (QDs) formed in a carbon nanotube (CNT) is presented. The CNT bridges metallic source and drain contacts on a piezoelectric host substrate, employing an acoustic alignment technique. The metal electrodes in contact with the nanotube provide tunnel barriers to the quasi one-dimensional electron system, hence forming a few QD in series due to the presence of defects within the CNT. The dynamic piezoelectric field associated with the surface wave leads to an acoustoelectric current through the system which turns out to be quantized like in a turnstile device.