从零能表面态可视化看UTe2中配对波函数的对称性
Pair Wavefunction Symmetry in UTe2 from Zero-Energy Surface State Visualization
AI总结：
本文通过s波超导扫描针尖在UTe2表面观测零能Andreev电导及散射干涉，结合邻近效应下的峰分裂，判定其超导序参量为非手性态，并认为B3u态最可能。
摘要：
尽管UTe2中节点自旋三重态拓扑超导性看起来很可能存在，但其超导序参量$Δ_k$仍未确定。理论上，一个独特的判据是超导拓扑表面带（TSB）的存在，它可以促进到s波超导体的零能Andreev隧穿，并且通过增强的s波邻近效应区分手性与非手性$Δ_k$。在这里，我们使用s波超导扫描针尖，在UTe2的(0-11)终止表面检测到强烈的零能Andreev电导。成像揭示了具有a轴取向的亚能隙准粒子散射干涉特征。观察到的零能Andreev峰分裂伴随增强的s波邻近效应，表明UTe2的$Δ_k$是非手性态：B1u、B2u或B3u。然而，如果沿a轴的准粒子散射是节间的，那么非手性B3u态与UTe2最为一致。
英文摘要：
Although nodal spin-triplet topological superconductivity appears probable in UTe2, its superconductive order-parameter $Δ_k$ remains unestablished. In theory, a distinctive identifier would be the existence of a superconductive topological surface band (TSB), which could facilitate zero-energy Andreev tunneling to an s-wave superconductor, and also distinguish a chiral from non-chiral $Δ_k$ via enhanced s-wave proximity. Here we employ s-wave superconductive scan-tips and detect intense zero-energy Andreev conductance at the UTe2 (0-11) termination surface. Imaging reveals sub-gap quasiparticle scattering interference signatures with a-axis orientation. The observed zero-energy Andreev peak splitting with enhanced s-wave proximity, signifies that $Δ_k$ of UTe2 is a non-chiral state: B1u, B2u or B3u. However, if the quasiparticle scattering along the a-axis is internodal, then a non-chiral B3u state is the most consistent for UTe2.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
