DOAJ Open Access 2022

Alternating twisted multilayer graphene: generic partition rules, double flat bands, and orbital magnetoelectric effect

Bo Xie Ran Peng Shihao Zhang Jianpeng Liu

Abstrak

Abstract Recently the alternating twisted trilayer graphene is discovered to exhibit unconventional superconductivity, which motivates us to study the electronic structures and possible correlation effects for this class of alternating twisted multilayer graphene (ATMG) systems. In this work we consider generic ATMG systems with M-L-N stacking configurations, in which the M (L) graphene layers and the L (N) layers are twisted by an angle θ (−θ). Based on analysis from a simplified k⋅p model approach, we derive generic partition rules for the low-energy electronic structures, which exhibit various band dispersions including two pairs of flat bands and flat bands co-existing with various gapless Fermionic excitations. For a mirror-symmetric ATMG system with doubled flat bands, we further find that Coulomb interactions may drive the system into a state with intertwined electric polarization and orbital magnetization orders, which can exhibit an interaction-driven orbital magnetoelectric effect.

Topik & Kata Kunci

Materials of engineering and construction. Mechanics of materials Computer software

Penulis (4)

Bo Xie

Ran Peng

Shihao Zhang

Jianpeng Liu

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Xie, B., Peng, R., Zhang, S., Liu, J. (2022). Alternating twisted multilayer graphene: generic partition rules, double flat bands, and orbital magnetoelectric effect. https://doi.org/10.1038/s41524-022-00789-5

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Informasi Jurnal

Tahun Terbit: 2022
Sumber Database: DOAJ
DOI: 10.1038/s41524-022-00789-5
Akses: Open Access ✓