†2nd Institute of Physics, RWTH Aachen University, 52056 Aachen, Germany.
⊥ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain.
Nano Lett. 2015 Jul 8;15(7):4417-22. doi: 10.1021/acs.nanolett.5b00765. Epub 2015 Jun 10.
We report transport measurements on a quantum dot in a partly suspended carbon nanotube. Electrostatic tuning allows us to modify and even switch "on" and "off" the coupling to the quantized stretching vibration across several charge states. The magnetic-field dependence indicates that only the two-electron spin-triplet excited state couples to the mechanical motion, indicating mechanical coupling to both the valley degree of freedom and the exchange interaction, in contrast to standard models.
我们报告了在部分悬浮的碳纳米管中的量子点上的输运测量结果。通过静电调谐，我们可以修改甚至“开启”和“关闭”跨越几个电荷状态的与量子伸缩振动的耦合。磁场依赖性表明，只有双电子自旋三重态激发态与机械运动耦合，这表明机械耦合到谷自由度和交换相互作用，与标准模型相反。
