编译 | 李言
Nature, 11 August 2022, Volume 608 Issue 7922
《自然》 2022年8月11日，第608卷，7922期
材料科学Material Science
Quantum cascade of correlated phases in trigonally warped bilayer graphene
三角弯曲双层石墨烯中相关相的量子级联
作者：Anna M. Seiler, Fabian R. Geisenhof, Felix Winterer et al.
链接：
https://www.nature.com/articles/s41586-022-04937-1
摘要：
在此，我们报告在伯纳尔双层石墨烯中电场控制的Lifshitz转变和范霍夫奇点附近观察到的一系列相关相。我们为观察到以半金属和四分之一金属形式的斯通纳铁磁体提供了证据。
此外，我们确定了在零磁场下拓扑非平凡维格纳-霍尔晶体及其向平凡维格纳晶体转变的特征，以及两种行为与标准费米液体的行为相偏离的相关金属。我们在这个可重复的、可调的、简单的系统中的结果为研究强相关电子研究打开了新的视野。
Abstract：
Here we report the observation of a cascade of correlated phases in the vicinity of electric-field-controlled Lifshitz transitions and van Hove singularities in Bernal bilayer graphene. We provide evidence for the observation of Stoner ferromagnets in the form of half and quarter metals. Furthermore, we identify signatures consistent with a topologically non-trivial Wigner–Hall crystal at zero magnetic field and its transition to a trivial Wigner crystal, as well as two correlated metals whose behaviour deviates from that of standard Fermi liquids. Our results in this reproducible, tunable, simple system open up new horizons for studying strongly correlated electrons.
A mechanically strong and ductile soft magnet with extremely low coercivity
一种高强高塑、极低矫顽力的软磁体
作者：Liuliu Han, Fernando Maccari, Isnaldi R. Souza Filho et al.
链接：
https://www.nature.com/articles/s41586-022-04935-3
摘要：
