Cao Jien, Wang Qian, Rolandi Marco, Dai Hongjie
Department of Chemistry and Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA.
Phys Rev Lett. 2004 Nov 19;93(21):216803. doi: 10.1103/PhysRevLett.93.216803. Epub 2004 Nov 17.
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 Phi0 = 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.
研究发现，在法布里 - 珀罗干涉区域中，平行于手性单壁碳纳米管轴施加相对较低的磁场会对纳米管的p沟道或价带电导产生大幅调制。螺旋电子的两个场致非简并子带之间的阿哈罗诺夫 - 玻姆型干涉中的拍频，是观察到的调制现象的原因，其伪周期远小于通过纳米管横截面达到磁通量子Φ0 = h/e所需的周期。我们表明，单壁纳米管是表现出阿哈罗诺夫 - 玻姆效应的最小圆柱体，具有由反映纳米管手性的明确分子轨道产生的丰富干涉和拍频现象。
