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Interaction-driven quantum Hall wedding cake-like structures in graphene quantum dots

机译：石墨烯量子点中相互作用驱动的量子霍尔喜饼状结构

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摘要

Quantum-relativistic matter is ubiquitous in nature; however, it is notoriously difficult to probe. The ease with which external electric and magnetic fields can be introduced in graphene opens a door to creating a tabletop prototype of strongly confined relativistic matter. Here, through a detailed spectroscopic mapping, we directly visualize the interplay between spatial and magnetic confinement in a circular graphene resonator as atomic-like shell states condense into Landau levels. We directly observe the development of a "wedding cake"-like structure of concentric regions of compressible-incompressible quantum Hall states, a signature of electron interactions in the system. Solid-state experiments can, therefore, yield insights into the behavior of quantum-relativistic matter under extreme conditions.
机译：量子相对论在自然界是无处不在的。然而，众所周知，它很难探测。可以在石墨烯中引入外部电场和磁场的简便性为创建具有严格限制的相对论性物质的桌面原型打开了一扇门。在这里，通过详细的光谱映射，我们可以直观地看到圆形石墨烯谐振器中的空间和磁约束之间的相互作用，因为原子状的壳态凝结为Landau能级。我们直接观察到可压缩-不可压缩的量子霍尔态的同心区域的“婚礼蛋糕”状结构的发展，这是系统中电子相互作用的标志。因此，固态实验可以深入了解极端条件下量子相对论物质的行为。

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  • 来源
    《Science》 |2018年第6404期|789-794|共6页
  • 作者

    Gutierrez Christopher; Walkup Daniel; Ghahari Fereshte; Lewandowski Cyprian; Rodriguez-Nieva Joaquin F.; Watanabe Kenji; Taniguchi Takashi; Levitov Leonid S.; Zhitenev Nikolai B.; Stroscio Joseph A.;

  • 作者单位

    NIST, Ctr Nanoscale Sci & Technol, Gaithersburg, MD 20899 USA;

    NIST, Ctr Nanoscale Sci & Technol, Gaithersburg, MD 20899 USA;

    NIST, Ctr Nanoscale Sci & Technol, Gaithersburg, MD 20899 USA;

    MIT, Dept Phys, Cambridge, MA 02139 USA;

    Harvard Univ, Dept Phys, Cambridge, MA 02138 USA;

    Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan;

    Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan;

    MIT, Dept Phys, Cambridge, MA 02139 USA;

    NIST, Ctr Nanoscale Sci & Technol, Gaithersburg, MD 20899 USA;

    NIST, Ctr Nanoscale Sci & Technol, Gaithersburg, MD 20899 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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