2026-07-23 沖縄科学技術大学院大学
CeTe₃は層状量子材料である。各層は、テルルとセリウム原子（青色）を含む中央層を、二つの導電性テルル正方格子層（金色）が挟む構造をしている。© 大熊隆太郎
＜関連情報＞
- https://www.oist.jp/ja/news-center/news/2026/7/23/striped-or-checkered-magnetic-field-influences-competing-electronic-patterns-graphene-quantum
- https://www.nature.com/articles/s41467-026-75048-y
反強磁性二次元半金属における絡み合った複数のフラストレーションによって実現される多様な電子相 Versatile electronic phases enabled by intertwined multiple frustrations in an antiferromagnetic two-dimensional semimetal
Y. Fujisawa,P. Wu,T. Nakamura,R. Okuma,T. Kato,B. R. M. Smith,D. Ueta,R. Kobayashi,N. Maekawa,C-H. Hsu,C. De,N. Tomoda,T. Higashihara,K. Morishita,K. Sumida,K. Miyamoto,T. Okuda,Z. Y. Wang & Y. Okada
Nature Communications Published:23 July 2026
DOI:https://doi.org/10.1038/s41467-026-75048-y
Abstract
Following the discovery of graphene, van der Waals materials have become a major platform for quantum matter, yet strongly interacting phases beyond graphene remain elusive. Using scanning tunneling microscopy and spectroscopy, we uncover three competing stripe- and checkerboard-type multiple-q antiferromagnetic charge-ordered states in the van der Waals semimetal CeTe3, beyond the conventional charge density wave. These field-tunable states exhibit propagation vectors of (0.33, 0), (0, 0.08), and (0.19, ±0.19), and are controlled by a modest in-plane magnetic field (~1.5 T). Quasiparticle-interference imaging identifies corresponding three distinct nesting channels and associated Fermi-surface reconstructions. At the same time, spectroscopy reveals a broad electronic reconstruction extending to ±30 meV around the Fermi level, beyond a simple Kondo-coupling picture. Our results establish CeTe3 as a platform for tunable nanoscale antiferromagnetic electronic phases characterized by intertwined correlations, exotic symmetry-breaking, and nontrivial topology.
