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在石墨烯中成像可调的量子霍尔破对称顺序

Alexis Coissard¹, David Wander¹, Hadrien Vignaud¹

¹Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, Grenoble, France.

|May 4, 2022

概括

研究人员可视化了石墨烯中的奇特电子状态

科学领域:

凝聚物质物理学
量子材料
强烈相关的电子系统

背景情况:

平面带中的电子表现出微不足道的动能,导致由库伦相互作用驱动的奇异多体状态.
石墨烯的零度兰道水平是强烈相互作用的平面带的一个主要例子,理论上预测它会容纳多种破碎对称状态.

研究的目的:

直接可视化和描述石墨烯中断对称相的格子尺度顺序.
通过操纵库伦相互作用选和磁场来探索这些阶段的可调性.

主要方法:

采用扫描道光谱来绘制石墨烯中不同的折叠相.
通过改变介电环境 (低/高介电常数) 和磁场强度来研究相图.

主要成果:

在未选的石墨烯中确定了Kekulé键序,与Kosterlitz-Thouless过渡观察一致.
在低磁场的介电选下观察到一个亚晶格不极化的基本状态,在更高的磁场中转换为电荷密度波序.
发现了与Kekulé并存的二次格子尺度顺序和电荷密度波顺序,超出了理论预测.

结论:

直接可视化证实了石墨烯中多个折叠相, 通过介电选可调节.
结果显示相位图比预测更丰富,强调了库伦相互作用选的重要性.
这项工作为探索其他量子材料的相关相提供了宝贵的平台.

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