递归超莫尔势重整化的双层石墨烯电子能带结构中的高阶布拉格带隙
Higher-order Bragg gaps in the electronic band structure of bilayer graphene renormalized by recursive supermoiré potential
AI总结：
本研究针对双层石墨烯与hBN双重对齐体系，利用双莫尔势干涉生成超莫尔图案实现能带重整化，产生低能高阶分形布拉格带隙，经输运测量验证模型预测，为超莫尔系统准布里渊区面积量子化提供直接实验证据。
摘要：
本快报呈现了我们关于双层石墨烯与六方氮化硼（hBN）双重对齐下手性费米子递归带隙工程的研究发现。通过利用两个相互干涉的莫尔势，我们生成了一种超莫尔图案，该图案会重整化原始双层石墨烯的电子能带，即使在极低能量下也能产生高阶分形带隙。这些布拉格带隙可通过系统内周期区域的独特线性组合进行映射。为验证我们的发现，我们采用电子输运测量来确定这些带隙的位置随载流子密度的变化关系，并证实其与通过连续介质模型得到的预测载流子密度及相应量子数相符。我们的工作为超莫尔系统中准布里渊区面积的量子化提供了直接实验证据，填补了在理解递归双周期超晶格势对狄拉克费米子能带结构调控方面的关键空白。
英文摘要：
This letter presents our findings on the recursive band gap engineering of chiral fermions in bilayer graphene doubly aligned with hBN. By utilizing two interfering moiré potentials, we generate a supermoiré pattern which renormalizes the electronic bands of the pristine bilayer graphene, resulting in higher-order fractal gaps even at very low energies. These Bragg gaps can be mapped using a unique linear combination of periodic areas within the system. To validate our findings, we used electronic transport measurements to identify the position of these gaps as functions of the carrier density and establish their agreement with the predicted carrier densities and corresponding quantum numbers obtained using the continuum model. Our work provides direct experimental evidence of the quantization of the area of quasi-Brillouin zones in supermoiré systems. It fills essential gaps in understanding the band structure engineering of Dirac fermions by a recursive doubly periodic superlattice potential.
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。
