AI 中文总结
本文研究铁基超导体的STS谱，发现量子阱镜面对称破缺可诱导奇偶宇称STS谱，建立能隙标度律，其预测的能隙与实验结果吻合，为高温超导理论提供新见解。
AI 中文摘要
确定超导扫描隧道谱（STS）是否唯一由晶体结构决定，是凝聚态物理中的一个基础挑战。本文系统研究了体FeSe单晶、单层FeSe和KCa₂Fe₄As₄F₂，解析出1阶、2阶和3阶棋盘状量子阱结构，其与实验观测到的1对、2对和3对超导相干峰完全匹配。在体FeSe中，量子阱促进实空间库珀对配对，形成简并反铁磁棋盘子晶格，产生玻色型偶宇称STS响应；在单层FeSe中，镜面对称破缺抑制库珀对配对，诱导非简并铁磁子晶格二分，产生费米型奇宇称STS谱。本文建立了通用的能隙标度律Δ(T, ξ)=η(T)/ξ²，其中η(T)为温度相关的 prefactor，ξ为量子阱深度，其决定超导能隙的数量和大小。对于KCa₂Fe₄As₄F₂，本文预测的±6.2 meV、±5.6 meV和±4.2 meV能隙对，与实验测得的±6.2 meV、±5.4 meV和±4.4 meV结果吻合极佳。该量子阱机制将镜面对称破缺、棋盘子晶格有序、库珀对配对、费米-玻色对偶及半Bogoliubov态统一起来用于STS解释，为建立统一的高温超导电性理论提供了新视角。
英文摘要
Determining whether superconducting scanning tunneling spectroscopy (STS) is uniquely dictated by crystal structure constitutes a fundamental challenge in condensed matter physics. Here, we systematically investigate bulk FeSe single crystals, monolayer FeSe, and $\mathrm{KCa_2Fe_4As_4F_2}$. We resolve one-, two-, and three-order checkerboard quantum-well structures that perfectly match the experimentally observed one, two, and three pairs of superconducting coherence peaks. In bulk FeSe, quantum wells promote real-space Cooper pairing and form degenerate antiferromagnetic checkerboard sublattices, yielding bosonic even-parity STS responses. In monolayer FeSe, mirror symmetry breaking suppresses Cooper pairing and induces nondegenerate ferromagnetic sublattice dichotomy, producing fermionic odd-parity STS spectra. We establish a universal gap scaling law $Δ(T, ξ) = η(T)/ξ^2$, where $η(T)$ is a temperature-dependent prefactor and $ξ$ denotes quantum-well depth that governs the number and magnitude of superconducting gaps. For $\mathrm{KCa_2Fe_4As_4F_2}$, our predicted gap pairs of $\pm6.2$ meV, $\pm5.6$ meV, and $\pm4.2$ meV are in excellent agreement with experimental results of $\pm6.2$ meV, $\pm5.4$ meV, and $\pm4.4$ meV. This quantum-well mechanism unifies mirror symmetry breaking, checkerboard sublattice ordering, Cooper pairing, fermion-boson duality, and half-Bogoliubov states for STS interpretation, offering new insights toward a unified high-$T_\text{c}$ superconductivity theory.
Comments10 pages, 6 figures
