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arXiv 1804.08196cond-mat.mtrl-scicond-mat.mes-hall
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三层石墨烯的高分辨透射光谱研究

High-resolution Tunneling Spectroscopy of ABA-stacked Trilayer Graphene

Yu Zhang, Jia-Bin Qiao, Long-Jing Yin, Lin He

摘要:

ABA堆叠的三层石墨烯(TLG)是由无质量和有质量狄拉克费米子组成的最简单的系统,有望表现出许多有趣的对称性破缺量子霍尔态和相互作用诱导现象。然而,在显微镜下识别的TLG和有限的光谱分辨率的堆叠顺序的困难,阻碍了这些有趣的状态和现象在扫描隧道显微镜(STM)研究的实验探针。在这里,我们研究了ABA TLG电子结构的详细功能,通过使用高分辨率STM测量。观测到了无质量和有质量狄拉克费米子的朗道能级(LL)交叉,以及有质量狄拉克费米子的有效质量重整化,表明ABA TLG中存在较强的电子-电子相互作用。最出乎意料的是,我们观察到非常规分裂的最低的LLS的无质量和有质量的狄拉克费米子在高垂直磁场。这些分裂的LLS,这是超出了紧束缚计算的描述,揭示了未探索的对称性破缺量子霍尔态的ABA TLG诱导的多体效应。

英文摘要:

ABA-stacked trilayer graphene (TLG), the simplest system consisting of both massless and massive Dirac fermions, is expected to exhibit many interesting broken-symmetry quantum Hall states and interaction-induced phenomena. However, difficulties in microscopically identifying the stacking order of the TLG and limited spectroscopic resolution have stymied experimental probes of these interesting states and phenomena in scanning tunneling microscopy (STM) studies. Here we studied the detailed features of the electronic structure in the ABA TLG by using high-resolution STM measurements. Landau-level (LL) crossings of the massless and massive Dirac fermions, and effective mass renormalization of the massive Dirac fermions were observed, indicating strong electron-electron interactions in the ABA TLG. Most unexpectedly, we observed unconventional splittings of the lowest LLs for both the massless and massive Dirac fermions in high perpendicular magnetic fields. These splittings of the LLs, which are beyond the description of tight-binding calculations, reveal unexplored broken-symmetry quantum Hall states in the ABA TLG induced by many-body effects.

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。

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