Aharonov-bohm interference and beating in single-walled carbon-nanotube interferometers
Aharonov-bohm interference and beating in single-walled carbon-nanotube interferometers
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DOI：
10.1103/physrevlett.93.216803
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发表时间：
2004-11-19
影响因子：
8.6
通讯作者：
Dai, HJ
中科院分区：
文献类型：
--
作者：
Cao, J;Wang, Q;Dai, HJ
平行于手性单壁碳纳米管的轴施加相对较低的磁场，发现在法布里-珀罗干涉制度中对纳米管的p沟道或价带电导产生大的调制。在Aharonov-Bohm型干涉中，两个场诱导的螺旋电子的非简并子带之间的跳动是观察到的调制的原因，其伪周期远小于通过纳米管横截面达到通量量子Phi（0）=h/e所需的伪周期。我们发现，单壁纳米管代表最小的圆柱体表现出丰富的干扰和跳动现象所产生的明确定义的分子轨道反射的纳米管手性的Aharonov-Bohm效应。
Relatively low magnetic fields applied parallel to the axis of a chiral single-walled carbon nanotube are found causing large modulations to the p channel or valence band conductance of the nanotube in the Fabry-Perot interference regime. Beating in the Aharonov-Bohm type of interference between two field-induced nondegenerate subbands of spiraling electrons is responsible for the observed modulation with a pseudoperiod much smaller than that needed to reach the flux quantum Phi(0)=h/e through the nanotube cross section. We show that single-walled nanotubes represent the smallest cylinders exhibiting the Aharonov-Bohm effect with rich interference and beating phenomena arising from well-defined molecular orbitals reflective of the nanotube chirality.