Quantum Interferences in Ultraclean Carbon Nanotubes
Quantum Interferences in Ultraclean Carbon Nanotubes
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DOI：
10.1103/physrevlett.126.216802
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发表时间：
2021-05-26
影响因子：
8.6
通讯作者：
Deshpande, Vikram V.
中科院分区：
文献类型：
--
作者：
Lotfizadeh, Neda;Senger, Mitchell J.;Deshpande, Vikram V.
光干涉的电子模拟是研究凝聚态量子现象的有力工具。在碳纳米管（CNT）中，已经确定可以实现电子法布里-珀罗干涉仪。其他类型的量子干涉也应该出现在碳纳米管中，但已经证明实现具有挑战性。特别是，碳纳米管已被确定为一个系统，以实现电子模拟的Sagnac干涉仪-最敏感的光学干涉仪。为了实现这种Sagnac效应，必须观察单个CNT中的不同传输通道之间的干扰。在这里，我们使用悬浮的，超净碳纳米管已知的手性指数研究法布里-珀罗和Sagnac电子干扰。我们验证的Sagnac振荡的行为和在高温下的Sagnac振荡的持久性的理论预测。正如现有的理论研究所建议的那样，我们的结果表明，这些量子干涉可以用于碳纳米管的电子结构表征和这些模型一维系统中的多体效应的研究。
Electronic analogs of optical interferences are powerful tools to investigate quantum phenomena in condensed matter. In carbon nanotubes (CNTs), it is well established that an electronic Fabry-Perot interferometer can be realized. Other types of quantum interferences should also arise in CNTs, but have proven challenging to realize. In particular, CNTs have been identified as a system to realize the electronic analog of a Sagnac interferometer-the most sensitive optical interferometer. To realize this Sagnac effect, interference between nonidentical transmission channels in a single CNT must be observed. Here, we use suspended, ultraclean CNTs of known chiral index to study both Fabry-Perot and Sagnac electron interferences. We verify theoretical predictions for the behavior of Sagnac oscillations and the persistence of the Sagnac oscillations at high temperatures. As suggested by existing theoretical studies, our results show that these quantum interferences may be used for electronic structure characterization of carbon nanotubes and the study of many-body effects in these model one-dimensional systems.