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Charge order and broken rotational symmetry in magic-angle twisted bilayer graphene

机译：魔角扭曲双层石墨烯的电荷序和破坏的旋转对称性

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摘要

Bilayer graphene can be modified by rotating (twisting) one layer with respect to the other. The interlayer twist gives rise to a moire superlattice that affects the electronic motion and alters the band structure(1-4). Near a 'magic angle' of twist(2,4), where the emergence of a flat band causes the charge carriers to slow down(3), correlated electronic phases including Mott-like insulators and superconductors were recently discovered(5-8) by using electronic transport. These measurements revealed an intriguing similarity between magic-angle twisted bilayer graphene and high-temperature superconductors, which spurred intensive research into the underlying physical mechanism(9-14). Essential clues to this puzzle, such as the symmetry and spatial distribution of the spectral function, can be accessed through scanning tunnelling spectroscopy. Here we use scanning tunnelling microscopy and spectroscopy to visualize the local density of states and charge distribution in magic-angle twisted bilayer graphene. Doping the sample to partially fill the flat band, we observe a pseudogap phase accompanied by a global stripe charge order that breaks the rotational symmetry of the moire superlattice. Both the pseudogap and the stripe charge order disappear when the band is either empty or full. The close resemblance to similar observations in high-temperature superconductors(15-21) provides new evidence of a deeper link underlying the phenomenology of these systems.
机译：可以通过相对于另一层旋转（扭曲）一层来改性双层石墨烯。层间扭曲会产生莫尔超晶格，从而影响电子运动并改变能带结构（1-4）。在扭曲的“魔角”（2,4）附近，出现平坦带会导致电荷载流子变慢（3），最近发现了相关的电子相，包括莫特式绝缘子和超导体（5-8）通过使用电子交通工具。这些测量结果揭示了魔角扭曲双层石墨烯与高温超导体之间的令人着迷的相似性，这激发了对潜在物理机理的深入研究（9-14）。可以通过扫描隧道光谱法获得有关此难题的基本线索，例如光谱函数的对称性和空间分布。在这里，我们使用扫描隧道显微镜和光谱学来观察魔角扭曲双层石墨烯中的局部态密度和电荷分布。掺杂样品以部分填充平坦带，我们观察到伪间隙相，伴随着整体条纹电荷顺序，这打破了莫尔超晶格的旋转对称性。当带为空或满时，伪间隙和条带电荷顺序都消失。与高温超导体中的类似观察结果非常相似（15-21），提供了新证据，表明这些系统的现象学具有更深的联系。

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  • 来源
    《Nature》 |2019年第7772期|91-95|共5页
  • 作者

    Jiang Yuhang; Lai Xinyuan; Watanabe Kenji; Taniguchi Takashi; Haule Kristjan; Mao Jinhai; Andrei Eva Y.;

  • 作者单位

    Rutgers State Univ Dept Phys & Astron Piscataway NJ 08854 USA;

    Natl Inst Mat Sci Tsukuba Ibaraki Japan;

    Rutgers State Univ Dept Phys & Astron Piscataway NJ 08854 USA|Univ Chinese Acad Sci Sch Phys Sci Beijing Peoples R China|Univ Chinese Acad Sci CAS Ctr Excellence Topol Quantum Computat Beijing Peoples R China;

  • 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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