Pressure-tuning topological phase transitions in Kagome superconductor CsTi$_3$Bi$_5$
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911811691872256 |
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| author | Wu, Wenfeng Bai, Xiaocheng Wang, Xianlong Liu, Dayong Zeng, Zhi Zou, Liangjian |
| author_facet | Wu, Wenfeng Bai, Xiaocheng Wang, Xianlong Liu, Dayong Zeng, Zhi Zou, Liangjian |
| contents | Recently, the Kagome metal CsTi$_3$Bi$_5$ has exhibited several novel quantum properties similar to CsV$_3$Sb$_5$, such as nontrivial topology, double-dome superconductivity, and flat band features. However, CsTi$_3$Bi$_5$ lacks the charge-density wave (CDW) present in CsV$_3$Sb$_5$, making the study of its emergence of double-dome superconductivity a focus of research. In this work, we have identified an order parameter, the three-band Z$_2$ topological index, that can describe the superconducting phase diagram of CsTi$_3$Bi$_5$ under pressure. Its evolution with pressure follows the expected behavior for superconductivity. Furthermore, the results of the Fermi surface under pressure reveal the potential presence of a Lifshitz transition in the vicinity of the vanishing point of the superconducting temperature change with pressure in CsTi$_3$Bi$_5$. These results indicate that the superconducting behavior of CsTi$_3$Bi$_5$ under pressure is caused by changes in the electronic structure leading to alterations in the topological properties, provide new insights and approaches for understanding the superconducting phenomenon in Kagome metals. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_16119 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Pressure-tuning topological phase transitions in Kagome superconductor CsTi$_3$Bi$_5$ Wu, Wenfeng Bai, Xiaocheng Wang, Xianlong Liu, Dayong Zeng, Zhi Zou, Liangjian Superconductivity Materials Science Recently, the Kagome metal CsTi$_3$Bi$_5$ has exhibited several novel quantum properties similar to CsV$_3$Sb$_5$, such as nontrivial topology, double-dome superconductivity, and flat band features. However, CsTi$_3$Bi$_5$ lacks the charge-density wave (CDW) present in CsV$_3$Sb$_5$, making the study of its emergence of double-dome superconductivity a focus of research. In this work, we have identified an order parameter, the three-band Z$_2$ topological index, that can describe the superconducting phase diagram of CsTi$_3$Bi$_5$ under pressure. Its evolution with pressure follows the expected behavior for superconductivity. Furthermore, the results of the Fermi surface under pressure reveal the potential presence of a Lifshitz transition in the vicinity of the vanishing point of the superconducting temperature change with pressure in CsTi$_3$Bi$_5$. These results indicate that the superconducting behavior of CsTi$_3$Bi$_5$ under pressure is caused by changes in the electronic structure leading to alterations in the topological properties, provide new insights and approaches for understanding the superconducting phenomenon in Kagome metals. |
| title | Pressure-tuning topological phase transitions in Kagome superconductor CsTi$_3$Bi$_5$ |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2403.16119 |