Universal interaction-driven gap in metallic carbon nanotubes
Universal interaction-driven gap in metallic carbon nanotubes
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DOI：
10.1103/physrevb.97.035445
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发表时间：
2018-01
影响因子：
3.7
通讯作者：
Mitchell J. Senger;Daniel R. McCulley;Neda Lotfizadeh;V. Deshpande;E. Minot
中科院分区：
文献类型：
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作者：
Mitchell J. Senger;Daniel R. McCulley;Neda Lotfizadeh;V. Deshpande;E. Minot
悬浮的金属碳纳米管（m-CNTs）表现出非常大的传输带隙，可以超过100 meV。实验和理论都表明，强的电子-电子相互作用在产生这种电子结构中起着至关重要的作用。为了进一步了解这种强相互作用的系统，我们已经进行了电子测量悬浮m-CNTs与已知的直径和手性角。光谱分辨光电流显微镜用于确定m-CNT结构。18个individualcontact m-CNTs的室温电特性进行了比较，其各自的直径和手性角。在电荷中性点，我们观察到m-CNT电阻的峰值，其与直径成反比呈指数关系。使用热激活输运模型，我们估计输运带隙为450 meV·nm/D，其中D是CNT直径。我们发现差距和CNT手征角之间没有相关性。我们的研究结果增加了重要的新的限制理论试图描述m-CNTs的电子结构。
Suspended metallic carbon nanotubes (m-CNTs) exhibit a remarkably large transport gap that can exceed 100 meV. Both experiment and theory suggest that strong electron-electron interactions play a crucial role in generating this electronic structure. To further understand this strongly-interacting system, we have performed electronic measurements of suspended m-CNTs with known diameter and chiral angle. Spectrally-resolved photocurrent microscopy was used to determine m-CNT structure. The room-temperature electrical characteristics of 18 individualcontacted m-CNTs were compared to their respective diameter and chiral angle. At the charge neutrality point, we observe a peak in m-CNT resistance that scales exponentially with inverse diameter. Using a thermally-activated transport model, we estimate that the transport gap is 450 meV·nm/D where D is CNT diameter. We find no correlation between the gap and the CNT chiral angle. Our results add important new constraints to theories attempting to describe the electronic structure of m-CNTs.