Pressure-induced superconductivity and topological phase transitions in the topological nodal-line semimetal SrAs3
| Autor: | Erjian Cheng, Lin Wang, Na Yu, Wei Xia, Wenge Yang, Weiwei Zhao, Hao Su, Xufeng Kou, Darren C. Peets, Yanfeng Guo, Zhenhai Yu, Xianbiao Shi, Zhiqiang Zou, Shiyan Li, Limin Yan, Yong Zhang, Dongzhe Dai, Xia Wang, Chuchu Zhu |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Superconductivity Phase transition Valence (chemistry) 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Topology lcsh:Atomic physics. Constitution and properties of matter 01 natural sciences Semimetal Electronic Optical and Magnetic Materials lcsh:QC170-197 Brillouin zone Topological insulator 0103 physical sciences lcsh:TA401-492 Density functional theory lcsh:Materials of engineering and construction. Mechanics of materials 010306 general physics 0210 nano-technology Surface states |
| Zdroj: | npj Quantum Materials, Vol 5, Iss 1, Pp 1-8 (2020) |
| ISSN: | 2397-4648 |
| DOI: | 10.1038/s41535-020-0240-6 |
| Popis: | Topological nodal-line semimetals (TNLSMs) are materials whose conduction and valence bands cross each other, meeting a topologically protected closed loop rather than discrete points in the Brillouin zone (BZ). The anticipated properties for TNLSMs, include drumhead-like nearly flat surface states, unique Landau energy levels, special collective modes, long-range Coulomb interactions, or the possibility of realizing high-temperature superconductivity. Recently, SrAs3 has been theoretically proposed and then experimentally confirmed to be a TNLSM. Here, we report high-pressure experiments on SrAs3, identifying a Lifshitz transition below 1 GPa and a superconducting transition accompanied by a structural phase transition above 20 GPa. A topological crystalline insulator (TCI) state is revealed by means of density functional theory (DFT) calculations on the emergent high-pressure phase. As the counterpart of topological insulators, TCIs possess metallic boundary states protected by crystal symmetry, rather than time reversal. In consideration of topological surface states (TSSs) and helical spin texture observed in the high-pressure state of SrAs3, the superconducting state may be induced in the surface states, and is most likely topologically nontrivial, making pressurized SrAs3 a strong candidate for topological superconductor. |
| Databáze: | OpenAIRE |
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