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arXiv · 2211.10302

Pressured-induced superconductivity extending across the topological phase transition in thallium-based topological materials TlBi(S1-xSex)2

Cuiying Pei·Peihao Huang·Peng Zhu·Linlin Liu·Qi Wang·Yi Zhao·Lingling Gao·Changhua Li·Weizheng Cao·Jian Lv·Xiang Li·Zhiwei Wang·Yugui Yao·Binghai Yan·Claudia Felser·Yulin Chen·Hanyu Liu·Yanpeng Qi
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Abstract

The coexistence of superconductivity and topology holds the potential to realize exotic quantum states of matter. Here we report that superconductivity induced by high pressure in three thallium-based materials, covering the phase transition from a normal insulator (TlBiS2) to a topological insulator (TlBiSe2) through a Dirac semimetal (TlBiSeS). By increasing the pressure up to 60 GPa, we observe superconductivity phase diagrams with maximal Tc values at 6.0-8.1 K. Our density-functional theory calculations reveal topological surface states in superconductivity phases for all three compounds. Our study paves the path to explore topological superconductivity and topological phase transitions.

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Cuiying Pei, Peihao Huang, Peng Zhu, Linlin Liu, Qi Wang, Yi Zhao, Lingling Gao, Changhua Li, Weizheng Cao, Jian Lv, Xiang Li, Zhiwei Wang, Yugui Yao, Binghai Yan, Claudia Felser, Yulin Chen, Hanyu Liu, Yanpeng Qi. 2022-11-18. Pressured-induced superconductivity extending across the topological phase transition in thallium-based topological materials TlBi(S1-xSex)2. https://arxiv.org/abs/2211.10302

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