Emergence of correlations in alternating twist quadrilayer graphene
Emergence of correlations in alternating twist quadrilayer graphene
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DOI：
10.1038/s41563-022-01286-2
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发表时间：
2022-07-07
期刊：
影响因子：
41.2
通讯作者：
Tutuc, Emanuel
中科院分区：
文献类型：
--
作者：
Burg, G. William;Khalaf, Eslam;Tutuc, Emanuel
交替扭曲多层石墨烯（ATMG）最近作为一个云纹系统家族出现，它与扭曲双层石墨烯具有几个基本特性，并且有望在魔角附近具有类似的强电子-电子相互作用。在这里，我们研究了交替扭转四层石墨烯（ATQG）样品，其扭转角为1.96度和1.52度，与1.68度的幻角略有不同。在较大的角度下，我们只在ATQG空穴掺杂时才发现相关绝缘体的特征，而没有超导的特征，而在较小的角度下，我们发现了超导的证据，而相关绝缘体的迹象减弱。我们的结果提供了对ATMG中相关相的扭角依赖的见解，并揭示了在魔角范围边缘的中间耦合状态中相关的性质，其中色散和相互作用是相同的顺序。报道了交替扭转四层石墨烯中相关关系的扭转角依赖性。
Alternating twist multilayer graphene (ATMG) has recently emerged as a family of moire 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 degrees and 1.52 degrees, which are slightly removed from the magic angle of 1.68 degrees. 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.The twist angle dependence of correlations in alternating twist quadrilayer graphene is reported.