Electron-phonon coupling of one-dimensional (3,0) carbon nanotube
Abstract
A very recent report claims that ambient-pressure high-temperature (Tc) superconductivity was found in boron-doped three-dimensional networks of carbon nanotubes (CNTs). Here, we systematically study the electron-phonon coupling (EPC) of one-dimensional (1D) (3,0) CNT under ambient pressure. Our results show that the EPC constant λ of the undoped 1D (3,0) CNT is 0.70, and reduces to 0.44 after 1.3 holes/cell doping. Further calculations show that the undoped (3,0) CNT is a two-gap superconductor with a superconducting Tc 33 K under ambient pressure. Additionally, we identify three characteristic phonon modes with strong EPC, establishing that the pristine (3,0) CNT is a high-Tc superconducting unit, and further suggest that searching for those superconducting units with strong EPC phonon mode would be an effective way to discover high-Tc phonon-mediated superconductors. Our study not only provide a crucial and timely theoretical reference for the recent report regarding superconducting CNTs, but also uncover that the pristine (3,0) CNT hosts the highest record of superconducting Tc among the elemental superconductors under ambient pressure.
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