Here are the summaries of the relevant entries regarding graphene and related topics:
- Berry Curvature of Low-Energy Excitons in Rhombohedral Graphene
This study investigates low-energy excitons in rhombohedral pentalayer graphene encapsulated by hexagonal boron nitride (hBN). It introduces a two-band model capturing band structure with excitons shifted from the moiré unit cell origin to $C_3$-symmetric points. The tunability of exciton positions with electric fields is highlighted, indicating potential applications for probing excitonic properties in moiré materials. 1
- Moiré fractional Chern insulators. III. Hartree-Fock Phase Diagram for Chern Insulator States in Rhombohedral Graphene
This work explores the interacting phase diagram of rhombohedral graphene aligned with hBN, particularly under applied displacement fields. It accounts for 3D interactions in multilayer systems and identifies stability regions for fractional Chern insulator states, shedding light on the interplay between moiré potential and electronic correlations. 2
- Moiré fractional Chern insulators. IV. Fluctuation-driven Collapse in Multiband Exact Diagonalization on Rhombohedral Graphene
This paper addresses the unique origins of fractional Chern insulators in pentalayer rhombohedral graphene, revealing non-interacting band structures are gapless. The fluctuation-driven collapse phenomena are discussed in the context of many-body interactions, offering insights into the material's unconventional properties. 3
- Topological Magnons and Domain Walls in Twisted Bilayer MoTe₂
The investigation reveals magnetic excitations in the quantum anomalous Hall insulator phase of twisted bilayer MoTe₂, highlighting the formation of low-energy topological magnon bands with distinct Chern numbers. The study analyzes the relationship between domain walls and chiral edge states, providing valuable insights into magnetic excitations in moiré systems. 4
- Dichotomy of Flat Bands in Van der Waals Ferromagnet Fe₅GeTe₂
This research discusses two types of flat electronic bands found in the van der Waals ferromagnet Fe₅GeTe₂, revealing their origins linked to electron correlations and geometrical frustrations. It explores how distinct spectral properties influence the behavior of these flat bands, contributing to the understanding of electronic ordering in quantum materials. 5
These entries collectively highlight advanced investigations into the unique properties and phenomena associated with graphene and related materials, specifically focusing on moiré structures, flat bands, and topological excitations, utilizing sophisticated experimental and theoretical frameworks.
- Berry Curvature of Low-Energy Excitons in Rhombohedral Graphene: This study explores low-energy excitons in rhombohedral pentalayer graphene (hBN/R5G/hBN). A novel low-energy two-band model provides a more accurate band structure, revealing that exciton Wannier functions are shifted from the moiré cell origin, suggestive of tunable excitonic properties under electric fields. The findings open pathways for detecting excitonic edge modes, making rhombohedral graphene a promising platform for investigating exciton topology in moiré materials. 1
- Moiré fractional Chern insulators. III. Hartree-Fock phase diagram, magic angle regime for Chern insulator states: The paper presents a detailed analysis of the interacting phase diagram of rhombohedral graphene aligned with hBN, emphasizing displacement-field tuning. The model incorporates 3D Coulomb interactions and various stacking orientations, significantly contributing to the understanding of Chern insulator states in these materials. 2
- Moiré fractional Chern insulators. IV. Fluctuation-driven collapse in multiband exact diagonalization calculations: This research reveals that fractional Chern insulators in pentalayer rhombohedral graphene/hexagonal boron nitride superlattices exhibit gapless noninteracting bands, challenging previous theoretical expectations. The study highlights the unique origins of observed FCIs and the implications for future research on band structures in similar materials. 3
- The study demonstrates that selective crystallization delay in wide-bandgap perovskites facilitates an initial homogeneous phase, leading to enhanced efficiency in square centimeter perovskite/organic tandem solar cells. 1
- Researchers achieved high-performance full-air-processed perovskite solar cells by modulating crystallization through surface reconstruction of the electron transport layer, improving stability and efficiency. 2