The transition metal dichalcogenide Ir1−xPtxTe2 displays both superconductivity and a topological band structure. Using angle-resolved photoemission spectroscopy, we obtain a comprehensive understanding of the three-dimensional electronic structure in the normal state of Ir1−xPtxTe2 for doping levels from x = 0.1 to 0.4, which spans the composition range of a superconducting state to a non-superconducting state. Many features of the electronic structure can be attributed to strong Te–Te interactions between the layers of the layered crystal structure and can be resolved by photon energy dependent measurements. We demonstrate that the type-II Dirac fermions can be successfully tuned via Pt doping, where the Dirac point lies close to the Fermi level for x = 0.1. The band evolution vs doping provides a clearer understanding of the relationship between the superconductivity and electronic structure. In addition, the β band in the superconducting samples locates the system close to a type-II van Hove singularity, where spin triplet paring symmetry has been predicted. Our results provide a comprehensive understanding of the band structure of Ir1−xPtxTe2, and we discuss the possibilities of the existence of topological superconductivity in this system.

中文翻译：

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对 II 型狄拉克半金属候选物 Ir1−xPtxTe2 的综合 ARPES 研究

过渡金属二硫属化物 Ir1−xPtxTe2 显示出超导性和拓扑能带结构。使用角分辨光电子能谱，我们全面了解了常态 Ir1−xPtxTe2 的三维电子结构，掺杂水平从 x = 0.1 到 0.4，涵盖了超导态到非超导态的组成范围。超导状态。电子结构的许多特征可归因于层状晶体结构各层之间的强 Te-Te 相互作用，并且可以通过光子能量相关测量来解决。我们证明了 II 型狄拉克费米子可以通过 Pt 掺杂成功调谐，其中狄拉克点位于 x = 0.1 的费米能​​级附近。能带演化与掺杂提供了对超导性和电子结构之间关系的更清晰的理解。此外，超导样品中的 β 带使系统靠近 II 型范霍夫奇点，其中预测了自旋三重配对对称性。我们的结果提供了对 Ir1−xPtxTe2 能带结构的全面理解，并讨论了该系统中存在拓扑超导性的可能性。