Magnetic damping of a carbon nanotube nano-electromechanical resonator
Magnetic damping of a carbon nanotube nano-electromechanical resonator
复制标题
DOI：
10.1088/1367-2630/14/8/083024
复制
发表时间：
2012-03
影响因子：
3.3
通讯作者：
D. Schmid;P. Stiller;C. Strunk;A. Hüttel
中科院分区：
文献类型：
--
作者：
D. Schmid;P. Stiller;C. Strunk;A. Hüttel
悬浮的双夹单壁碳纳米管在低温下进行表征。我们观察到嵌入量子点的直流电流光谱中的特定开关效应。这些先前已被确定为系统的纳米机电自激，其中单电子隧道效应的正反馈驱动机械运动。磁场通过提供额外的阻尼机制来抑制这种效应。这是通过涡流阻尼建模的，并通过测量射频驱动纳米机电谐振器在增强磁场中的谐振品质因数来证实。
A suspended, doubly clamped single-wall carbon nanotube is characterized at cryogenic temperatures. We observe specific switching effects in dc-current spectroscopy of the embedded quantum dot. These have been identified previously as nano-electromechanical self-excitation of the system, where positive feedback from single-electron tunneling drives mechanical motion. A magnetic field suppresses this effect, by providing an additional damping mechanism. This is modeled by eddy current damping, and confirmed by measuring the resonance quality factor of the radio-frequency-driven nano-electromechanical resonator in an increasing magnetic field.