论文标题
交替扭转Quadrilayer石墨烯中相关性的出现
Emergence of Correlations in Alternating Twist Quadrilayer Graphene
论文作者
论文摘要
最近，交替的Twist多层石墨烯（ATMG）已成为Moiré系统家族，它们与扭曲的双层石墨烯共享几种基本特性，并有望在魔术角附近托管类似强的Electron-Electron相互作用。在这里，我们研究了交替的扭曲Quadrilayer石墨烯（ATQG）样品，其扭曲角为1.96°和1.52°，它们从1.68°的魔法角度略微去除。在较大的角度，我们只有在ATQG被掺杂时才发现相关绝缘子的特征，并且没有超导性的签名，而对于较小的角度，我们找到了超导性的证据，而相关绝缘体的符号则弱化。我们的结果提供了对ATMG中相关相的扭角依赖性的洞察力，并阐明了魔术角范围边缘的中间耦合方案中相关性的性质，在魔法角度范围内分散和相互作用的序列相同。
Recently, alternating twist multilayer graphene (ATMG) has emerged as a family of moiré systems that share several fundamental properties with twisted bilayer graphene, and are expected to host similarly strong electron-electron interactions near the magic angle. Here, we study alternating twist quadrilayer graphene (ATQG) samples with twist angles of 1.96° and 1.52°, which are slightly removed from the magic angle of 1.68°. At the larger angle, we find signatures of correlated insulators only when the ATQG is hole doped, and no signatures of superconductivity, and for the smaller angle we find evidence of superconductivity, while signs of the correlated insulators weaken. Our results provide insight into the twist angle dependence of correlated phases in ATMG and shed light on the nature of correlations in the intermediate coupling regime at the edge of the magic angle range where dispersion and interaction are of the same order.
