Tunneling Spectroscopy in Carbon Nanotube-Hexagonal Boron Nitride-Carbon Nanotube Heterojunctions
| Autor: | Zhiwen Shi, Yoseob Yoon, Salman Kahn, Michael F. Crommie, Takashi Taniguchi, Fanqi Wu, Wenyu Zhao, Feng Wang, Dingzhou Cui, Kenji Watanabe, Wu Shi, SeokJae Yoo, M. Iqbal Bakti Utama, Zhiyuan Zhao, Sheng Wang, Sihan Zhao, Chongwu Zhou, Bosai Lyu |
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| Rok vydání: | 2020 |
| Předmět: |
Nanotube
Materials science Condensed matter physics Mechanical Engineering Physics::Medical Physics Bioengineering Heterojunction 02 engineering and technology General Chemistry Substrate (electronics) Carbon nanotube Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics law.invention Condensed Matter::Materials Science Luttinger liquid law Condensed Matter::Superconductivity Density of states General Materials Science 0210 nano-technology Spectroscopy Quantum tunnelling |
| Zdroj: | Nano letters. 20(9) |
| ISSN: | 1530-6992 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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