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首页> 外文期刊>Physical Review X >Orbital Origin of Extremely Anisotropic Superconducting Gap in Nematic Phase of FeSe Superconductor
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Orbital Origin of Extremely Anisotropic Superconducting Gap in Nematic Phase of FeSe Superconductor

机译：FESE超导体向甲型临时阶段极端各向异性超导间隙的轨道起源

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The iron-based superconductors are characterized by multiple-orbital physics where all the five Fe 3 d orbitals get involved. The multiple-orbital nature gives rise to various novel phenomena like orbital-selective Mott transition, nematicity, and orbital fluctuation that provide a new route for realizing superconductivity. The complexity of multiple-orbital physics also requires us to disentangle the relationship between orbital, spin, and nematicity, and to identify dominant orbital ingredients that dictate superconductivity. The bulk FeSe superconductor provides an ideal platform to address these issues because of its simple crystal structure and unique coexistence of superconductivity and nematicity. However, the orbital nature of the low-energy electronic excitations and its relation to the superconducting gap remain controversial. Here, we report direct observation of the highly anisotropic Fermi surface and extremely anisotropic superconducting gap in the nematic state of the FeSe superconductor by high-resolution laser-based angle-resolved photoemission measurements. We find that the low-energy excitations of the entire hole pocket at the Brillouin zone center are dominated by the single d x z orbital. The superconducting gap exhibits an anticorrelation relation with the d x z spectral weight near the Fermi level; i.e., the gap size minimum (maximum) corresponds to the maximum (minimum) of the d x z spectral weight along the Fermi surface. These observations provide new insights in understanding the orbital origin of the extremely anisotropic superconducting gap in the FeSe superconductor and the relation between nematicity and superconductivity in the iron-based superconductors.
机译：铁基超导体的特征在于多个轨道物理学，其中所有五种Fe 3 D轨道都涉及。多轨道性质引起各种新颖的现象，如轨道选择性的果酱，向外性和轨道波动提供了一种实现超导性的新途径。多轨道物理学的复杂性也要求我们解开眶下，旋转和向外性之间的关系，并鉴定决定超导性的主要轨道成分。批量FESE超级导体提供了一个理想的平台，以解决这些问题，因为其简单的晶体结构和超导和向外性的独特共存。然而，低能量电子激发的轨道性质及其与超导间隙的关系仍然存在争议。在这里，通过高分辨率激光的角度分辨的光曝光测量，我们报告了对FESE超导体的向燃烧状态下的高各向异性费米表面和极其极尖超导间隙的直接观察。我们发现布里渊区中心的整个孔口袋的低能量激励是由单个D X Z轨道的主导。超导间隙与Fermi水平附近的D X Z光谱重量表现出反形旋形关系;即，间隙尺寸最小（最大值）对应于Fermi表面的D X Z光谱重量的最大（最小）。这些观察结果提供了了解FESE超导体中极端各向异性超导间隙的轨道起源以及铁基超导体中极端各向异性超导间隙的关系和基于铁基超导体之间的关系。

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