Strain-tunable Dirac semimetal phase transition and emergent superconductivity in a borophane
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866929517281411072 |
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| author | Zhong, Chengyong Li, Xuelian Yu, Peng |
| author_facet | Zhong, Chengyong Li, Xuelian Yu, Peng |
| contents | A two-dimensional (2D) Dirac semimetal with concomitant superconductivity has been long sought but rarely reported. It is believed that light-element materials have the potential to realize this goal owing to their intrinsic lightweight and metallicity. Here, based on the recently synthesized $β_{12}$ hydrogenated borophene [Science 371, 1143 (2021)], we investigate its counterpart named $β_{12}$-$ \rm {B_5H_3}$. Our first-principles calculations suggest it has good stability. $β_{12}$-$ \rm {B_5H_3}$ is a scarce Dirac semimetal demonstrating a strain-tunable phase transition from three Dirac cones to a single Dirac cone. Additionally, $β_{12}$-$ \rm {B_5H_3}$ is also a superior phonon-mediated superconductor with a superconducting critical temperature of 32.4 K and can be further boosted to 42 K under external strain. The concurrence of Dirac fermions and superconductivity, supplemented with dual tunabilities, reveals $β_{12}$-$ \rm {B_5H_3}$ is an attractive platform to study either quantum phase transition in 2D Dirac semimetal or the superconductivity or the exotic physics brought about by their interplay. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_18400 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Strain-tunable Dirac semimetal phase transition and emergent superconductivity in a borophane Zhong, Chengyong Li, Xuelian Yu, Peng Materials Science Mesoscale and Nanoscale Physics Computational Physics A two-dimensional (2D) Dirac semimetal with concomitant superconductivity has been long sought but rarely reported. It is believed that light-element materials have the potential to realize this goal owing to their intrinsic lightweight and metallicity. Here, based on the recently synthesized $β_{12}$ hydrogenated borophene [Science 371, 1143 (2021)], we investigate its counterpart named $β_{12}$-$ \rm {B_5H_3}$. Our first-principles calculations suggest it has good stability. $β_{12}$-$ \rm {B_5H_3}$ is a scarce Dirac semimetal demonstrating a strain-tunable phase transition from three Dirac cones to a single Dirac cone. Additionally, $β_{12}$-$ \rm {B_5H_3}$ is also a superior phonon-mediated superconductor with a superconducting critical temperature of 32.4 K and can be further boosted to 42 K under external strain. The concurrence of Dirac fermions and superconductivity, supplemented with dual tunabilities, reveals $β_{12}$-$ \rm {B_5H_3}$ is an attractive platform to study either quantum phase transition in 2D Dirac semimetal or the superconductivity or the exotic physics brought about by their interplay. |
| title | Strain-tunable Dirac semimetal phase transition and emergent superconductivity in a borophane |
| topic | Materials Science Mesoscale and Nanoscale Physics Computational Physics |
| url | https://arxiv.org/abs/2409.18400 |