混合堆叠四层石墨烯中电极化的衬底、温度与磁场依赖性
Substrate, temperature and magnetic field dependence of electric polarisation in mixed-stacking tetralayer graphenes
AI总结：
本文比较了混合堆叠四层石墨烯的固有电极化与衬底对称性破缺效应，分析其温度与磁场依赖性，并提出可通过低温磁场依赖测量区分固有极化贡献。
摘要：
四层石墨烯（TLG：Bernal、菱面体和混合堆叠）的多型体是具有不同对称性的晶体结构。其中，混合堆叠四层体缺乏反演对称性，这允许产生固有的自发面外电极化，并在镜像对ABCB和ABAC堆叠中发生反转。在此，我们将此类TLG的固有极化与衬底的对称性破缺效应进行比较，后者也能在所有四种多型体（包括ABCB和ABAC孪晶）中产生不同大小的面外电偶极矩。我们分析了它们的温度和磁场依赖性，以理解最近测量的四层薄片开尔文探针力显微镜图的起源，并注意到基于低温下测得的极化磁场依赖性，可以单独区分出固有贡献。
英文摘要：
Polytypes of tetralayer graphene (TLG: Bernal, rhombohedral and mixed stacking) are crystalline structures with different symmetries. Among those, mixed-stacking tetralayers lack inversion symmetry, which allows for intrinsic spontaneous out-of-plane electrical polarisation, inverted in the mirror-image pair, ABCB and ABAC stackings. Here, we compare the intrinsic polarisation of such TLGs with the symmetry-breaking effect of a substrate, which can also generate out-of-plane electric dipole moments with different sizes in all four polytypes, including ABCB and ABAC twins. We analyse their temperature and magnetic field dependence, in view of understanding the origin of the recently measured Kelvin probe force microscopy maps of tetralayer flakes, and notice that the intrinsic contribution could be singled out based on magnetic field dependence of polarisation measured at low temperatures.
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。
