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arXiv 1001.4372cond-mat.mes-hall
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单电子隧穿与纳米机械运动的强耦合

Strong coupling between single-electron tunneling and nano-mechanical motion

G. A. Steele, A. K. Huettel, B. Witkamp, M. Poot, H. B. Meerwaldt, L. P. Kouwenhoven, H. S. J. van der Zant

摘要:

在高频下振荡的纳米级谐振器在许多测量应用中是有用的。我们研究了一种高质量的机械谐振器,它是由一个悬浮的碳纳米管制成的,通过使用附近的天线施加周期性的射频电势来驱动它运动。单电子电荷波动产生的机械共振频率的周期性调制。超过10 ^5的品质因数允许检测由在纳米管上添加单电子电荷引起的共振频率的偏移。机械运动和电子隧穿的强耦合的额外证据是由能量转移到电子,导致机械阻尼和不寻常的非线性行为。我们还发现,通过纳米管的直流电自发地驱动机械谐振器,施加与高频谐振机械运动一致的力。

英文摘要:

Nanoscale resonators that oscillate at high frequencies are useful in many measurement applications. We studied a high-quality mechanical resonator made from a suspended carbon nanotube driven into motion by applying a periodic radio frequency potential using a nearby antenna. Single-electron charge fluctuations created periodic modulations of the mechanical resonance frequency. A quality factor exceeding 10^5 allows the detection of a shift in resonance frequency caused by the addition of a single-electron charge on the nanotube. Additional evidence for the strong coupling of mechanical motion and electron tunneling is provided by an energy transfer to the electrons causing mechanical damping and unusual nonlinear behavior. We also discovered that a direct current through the nanotube spontaneously drives the mechanical resonator, exerting a force that is coherent with the high-frequency resonant mechanical motion.

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