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arXiv 2104.00261cond-mat.mes-hallcond-mat.mtrl-scicond-mat.soft
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h-BN/AB叠层-石墨烯异质结构莫尔超晶格中的非常规卫星电阻峰

Unconventional satellite resistance peaks in moiré superlattice of h-BN/ AB-stacked tetralayer-graphene heterostructure

Fumiya Mukai, Kota Horii, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi, Ryuta Yagi

摘要:

大多数关于由h-BN和石墨烯堆叠形成的莫尔超晶格的研究都集中在单层石墨烯上;对多层石墨烯的了解较少。在这里,我们表明,多层石墨烯的莫尔超晶格显示出由超晶格结构影响的各向异性费米表面产生的新特征。h-BN/AB堆叠的四层石墨烯异质结构的莫尔超晶格表现出电阻率峰,其显示出对垂直电场的复杂依赖性。这些峰不是由于二次狄拉克锥的形成,而是由于各向异性费米面的折叠而导致的能隙的打开。此外,超晶格峰是由轻质量和重质量的双层带通过超晶格势混合而产生的。间隙不是在超晶格布里渊区的边界上打开,而是在其内部打开,这反映了多层石墨烯费米表面的各向异性。

英文摘要:

Most studies on moiré superlattices formed from a stack of h-BN and graphene have focused on single layer graphene; graphene with multiple layers is less understood. Here, we show that a moiré superlattice of multilayer graphene shows new features arising from the anisotropic Fermi surface affected by the superlattice structure. The moiré superlattice of a h-BN/AB-stacked tetralayer graphene heterostructure exhibited resistivity peaks showing a complicated dependence on the perpendicular electric field. The peaks were not due to secondary Dirac cones forming, but rather opening of the energy gap due to folding of the anisotropic Fermi surface. In addition, superlattice peaks resulted from mixing of light- and heavy-mass bilayer-like bands via the superlattice potential. The gaps did not open on the boundary of the superlattice Brillouin zone, but rather opened inside it, which reflected the anisotropy of the Fermi surface of multilayer graphene.

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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