论文标题
电荷密度超导体Inxtase2中拓扑Weyl环的各向异性间隙2
Anisotropic gapping of topological Weyl rings in the charge-density-wave superconductor InxTaSe2
论文作者
论文摘要
拓扑材料和拓扑阶段最近已成为冷凝物质物理学的热门话题。在这项工作中，我们报告了在有电荷密度波（CDW）和超导性的情况下，拓扑结节半学INXTASE2。在X = 0.58样品中，分别在116 K和77 K以下观察到2 * /3相称的CDW（CCDW）和2 * 2 CCDW。与理论计算一致，旋转轨道耦合产生了通过鼓头表面状态连接的两个两倍的结节环（Weyl环（Weyl环），通过角度分辨的光发射光谱证实。我们的结果表明，根据CDW带折叠，2 * 2 CCDW订购了一个Weyl环，而另一个Weyl环则保持完整的表面状态。此外，超导性在0.91 K处出现，上部临界场偏离了低温下的S波行为，这可能是可能非常规的超导性。因此，Inxtase2代表了一个有趣的材料系统，用于研究CDW，非平凡带拓扑和超导性之间的相互作用。
Topological materials and topological phases have recently become a hot topic in condensed matter physics. In this work, we report a topological nodal-line semimetal InxTaSe2, in the presence of both charge density wave (CDW) and superconductivity. In the x = 0.58 samples, the 2 * /3 commensurate CDW (CCDW) and the 2 * 2 CCDW are observed below 116 K and 77 K, respectively. Consistent with theoretical calculations, the spin-orbital coupling gives rise to two two-fold-degenerate nodal rings (Weyl rings) connected by drumhead surface states, confirmed by angle-resolved photoemission spectroscopy. Our results suggest that the 2 * 2 CCDW ordering gaps out one Weyl ring in accordance with the CDW band folding, while the other Weyl ring remains gapless with intact surface states. In addition, superconductivity emerges at 0.91 K, with the upper critical field deviating from the s-wave behavior at low temperature, implying possibly unconventional superconductivity. Therefore, InxTaSe2 represents an interesting material system to study the interplay between CDW, nontrivial band topology and superconductivity.
