Large modulations in the intensity of Raman-scattered light from pristine carbon nanotubes.
Large modulations in the intensity of Raman-scattered light from pristine carbon nanotubes.
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DOI：
10.1103/physrevlett.103.067401
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发表时间：
2009-08
影响因子：
8.6
通讯作者：
Adam W. Bushmaker;V. Deshpande;Scott S. Hsieh;M. Bockrath;S. Cronin
中科院分区：
文献类型：
--
作者：
Adam W. Bushmaker;V. Deshpande;Scott S. Hsieh;M. Bockrath;S. Cronin
在原始、悬浮、准金属、单壁碳纳米管的拉曼强度中观察到高达 2 个数量级的大调制，以响应所施加的栅极电势。没有观察到共振条件的变化，并且无论声子能量或激光激发能量如何，所有拉曼谱带都表现出相同的强度变化。在半导体纳米管中没有观察到这种效应。电子能隙与拉曼强度的下降相关，最近观察到的莫特绝缘行为被认为是这种效应的可能解释。
Large modulations of up to 2 orders of magnitude are observed in the Raman intensity of pristine, suspended, quasimetallic, single-walled carbon nanotubes in response to applied gate potentials. No change in the resonance condition is observed, and all Raman bands exhibit the same changes in intensity, regardless of phonon energy or laser excitation energy. The effect is not observed in semiconducting nanotubes. The electronic energy gaps correlate with the drop in the Raman intensity, and the recently observed Mott insulating behavior is suggested as a possible explanation for this effect.