Tunneling Spectroscopy in Carbon Nanotube-Hexagonal Boron Nitride-Carbon Nanotube Heterojunctions
Tunneling Spectroscopy in Carbon Nanotube-Hexagonal Boron Nitride-Carbon Nanotube Heterojunctions
复制标题
碳纳米管-六方氮化硼-碳纳米管异质结中的隧道光谱
DOI：
10.1021/acs.nanolett.0c02585
复制
发表时间：
2020-09-09
期刊：
影响因子：
10.8
通讯作者：
Wang, Feng
中科院分区：
文献类型：
--
作者：
Zhao, Sihan;Yoo, SeokJae;Wang, Feng
电子隧穿光谱是一种强有力的技术，可以探测一维（1D）单壁碳纳米管（SWNT）的独特物理性质，例如态密度中的货车霍韦奇异性或Luttinger液体的幂律隧穿概率。然而，很少有人知道的隧道行为之间的两个一维单壁碳纳米管在一个大的能谱。在这里，我们研究了在独特的碳纳米管-六方氮化硼-碳纳米管异质结中，两个交叉的单壁碳纳米管之间的电子隧穿行为。我们观察到许多尖锐的共振的差分隧穿电导在不同的偏置电压之间施加的单壁碳纳米管。这些共振可以归因于弹性隧穿到货车霍韦奇异性的不同的一维子带在两个单壁碳纳米管，它们使我们能够确定准粒子带隙和更高的躺在绝缘基板上的单壁碳纳米管的一维子带。
Electron tunneling spectroscopy is a powerful technique to probe the unique physical properties of one-dimensional (1D) single-walled carbon nanotubes (SWNTs), such as the van Hove singularities in the density of states or the power-law tunneling probability of a Luttinger liquid. However, little is known about the tunneling behavior between two 1D SWNTs over a large energy spectrum. Here, we investigate the electron tunneling behavior between two crossed SWNTs across a wide spectral window up to 2 eV in the unique carbon nanotube-hexagonal boron nitride-carbon nanotube heterojunctions. We observe many sharp resonances in the differential tunneling conductance at different bias voltages applied between the SWNTs. These resonances can be attributed to elastic tunneling into the van Hove singularities of different 1D subbands in both SWNTs, and they allow us to determine the quasi-particle bandgaps and higher-lying 1D subbands in SWNTs on the insulating substrate.