The influence of coupling between chains on the conductivity of atomic carbon chains

Liang, Zhewen; Xu, Xiaodong; Jiang, Yingjie; Li, Weiqi; Wang, Qiang; Zhang, Guiling; Jiang, Yongyuan

doi:10.1016/j.physleta.2019.04.053

Cited by 5 publications

(1 citation statement)

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“…Also (semi-conducting) polyyne to (metallic) cumulene transition has been demonstrated experimentally under application of strain [32]. In the theoretical front, the effect of coupling on finite length carbon chains bridging graphene electrodes on conductivity has recently been studied, [33] which shows noticeable variation depending upon even or odd number of atoms in the chain.…”

Section: Introductionmentioning

confidence: 99%

Structural Deformation and Metal-Semiconductor Transition in Coupled Carbon Chains

Basu¹,

Bhattacharyya²

2022

Preprint

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The transition between gapped (semiconducting) and gapless (metallic) phases and tunability of bandgap in materials is a very lucrative yet considerably challenging goal for new-age device preparation. For bulk materials and for two-dimensional layered systems, this is a rapidly expanding field. We theoretically propose a onedimensional pure carbon material with a tunable bandgap. We find that two parallel coupled polyyne chains show metallic behaviour with bands crossing on the Fermi level, unlike the single semiconducting chain. The number of nodal points (two) is robust under transverse and longitudinal strain, indicating the symmetry-protected nature of the metallic phase. Sliding one chain with respect to the other breaks reflection symmetry and a clear bandgap opens up at the nodes, leading to a gapped phase. By varying the slide parameter, the bandgap can be tuned efficiently. This work initiates and indicates possible topological phases of real one-dimensional materials without the involvement of edge modes.

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Section: Introductionmentioning

confidence: 99%