论文标题
基于FESE的材料中的异国情调超导状态
Exotic Superconducting States in FeSe-based Materials
论文作者
论文摘要
在过去的十年中，在基于FESE的材料中发现的高温超导和在基于FESE的材料中发现的各种异国情调的超导状态一直存在。独特的特性源自多频道电子结构，强烈的轨道依赖现象，极小的费米能量，电子词性和拓扑方面产生了许多独特而引人入胜的超导状态。在这里，我们概述了我们目前对{\ it bumb}基于基于FESE的材料的超导性的理解，该材料的重点是FESE和ISOVILENT替代的FESE $ _ {1-x} $ s $ s $ _ {x} $ _ {x} $和FESE $ _ {1-x} $ {1-x} $ TE $ _ {x $ _ {X x} $。我们讨论了FESE中高度非平凡的超导性能，包括极端各向异性配对状态，从Bardeen--cooper--schrieffer（BCS）到Bose-bose-inder-Einstein凝结（BEC）状态的跨界现象，一种新型的现场诱导的超导导相位阶段，以及破裂的时间反向反向对称性。我们还讨论了用硫和醇掺杂的超导间隙函数的演变，特别注意量子关键列列的影响和拓扑超导性的影响。基于FESE的材料为研究各种外来的超导状态提供了绝佳的操场。
High-temperature superconductivity and a wide variety of exotic superconducting states discovered in FeSe-based materials have been at the frontier of research on condensed matter physics over the past decade. Unique properties originating from the multiband electronic structure, strongly orbital-dependent phenomena, extremely small Fermi energy, electronic nematicity, and topological aspects give rise to many distinct and fascinating superconducting states. Here, we provide an overview of our current understanding of the superconductivity of {\it bulk} FeSe-based materials, focusing on FeSe and the isovalent substituted FeSe$_{1-x}$S$_{x}$ and FeSe$_{1-x}$Te$_{x}$. We discuss the highly nontrivial superconducting properties in FeSe, including extremely anisotropic pairing states, crossover phenomena from Bardeen--Cooper--Schrieffer (BCS) to Bose--Einstein condensation (BEC) states, a novel field-induced superconducting phase, and broken time-reversal symmetry. We also discuss the evolution of the superconducting gap function with sulfur and tellurium doping, paying particular attention to the impact of quantum critical nematic fluctuations and the topological superconductivity. FeSe-based materials provide an excellent playground to study various exotic superconducting states.
