arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.09341cond-mat.mes-hall
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驱动扭曲双层石墨烯中的磁织构

Emergent magnetic texture in driven twisted bilayer graphene

D. A. Bahamon, G. Gómez-Santos, T. Stauber

摘要:

研究了不同扭曲角下双层石墨烯势垒的输运性质。值得注意的是,对于围绕魔角$θ_m \sim 1.05^{\circ}$的小扭转角,AA堆叠区域周围的局部电流与注入电子速率相比被强烈增强。此外,总电流和逆流(磁)电流模式在这些区域中显示出高度相关性,从而产生了形成磁性莫尔超晶格的定义明确的磁矩。这些磁矩的方向和大小的变化作为门电压的函数和可能的影响紧急自旋液体行为进行了讨论。

英文摘要:

The transport properties of a twisted bilayer graphene barrier are investigated for various twist angles. Remarkably, for small twist angles around the magic angle $θ_m \sim 1.05^{\circ}$, the local currents around the AA-stacked regions are strongly enhanced compared to the injected electron rate. Furthermore, the total and counterflow (magnetic) current patterns show high correlations in these regions, given rise to well-defined magnetic moments that form a magnetic Moiré superlattice. The orientation and magnitude of these magnetic moments changes as function of the gate voltage and possible implications for emergent spin-liquid behaviour are discussed.

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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