三维五角碳与突现费米子的起源
Three-dimensional Pentagon Carbon with a genesis of emergent fermions
摘要：
碳是我们宇宙的基本组成部分，具有大量的同素异形结构。由于其成键特性，大多数碳同素异形体具有六方环的图案。在这里，与第一性原理计算，我们发现了一个新的亚稳三维碳同素异形体完全由五边形环。这种“五角碳”的独特结构导致了非凡的电子特性，使其成为涌现的拓扑费米子的聚宝盆。在晶格应变下，五角碳表现出拓扑相变，产生一系列新的准粒子，从同位旋-1三重态费米子，到三重态简并费米子，再到串联的Weyl环费米子。它的朗道能级谱也表现出明显的特征，包括大量的几乎简并的手征朗道带，这意味着明显的磁输运信号。我们的工作不仅发现了一个显着的碳同素异形体与非常罕见的结构图案，它也揭示了一个迷人的层次粒子成因与新的拓扑费米子超越狄拉克和外尔范式。
英文摘要：
Carbon, the basic building block of our universe, enjoys a vast number of allotropic structures. Owing to its bonding characteristic, most carbon allotropes possess the motif of hexagonal rings. Here, with first-principles calculations, we discover a new metastable three-dimensional carbon allotrope entirely composed of pentagon rings. The unique structure of this "Pentagon Carbon" leads to extraordinary electronic properties, making it a cornucopia of emergent topological fermions. Under lattice strain, Pentagon Carbon exhibits topological phase transitions, generating a series of novel quasiparticles, from isospin-1 triplet fermions, to triply-degenerate fermions, and further to concatenated Weyl-loop fermions. Its Landau level spectrum also exhibits distinct features, including a huge number of almost degenerate chiral Landau bands, implying pronounced magneto-transport signals. Our work not only discovers a remarkable carbon allotrope with highly rare structural motifs, it also reveals a fascinating hierarchical particle genesis with novel topological fermions beyond the Dirac and Weyl paradigm.
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。
