Tuning Magnetic Order in CrI3 Bilayers via Moiré Patterns

León, Andrea; Velásquez, E. A.; Caro-Lopera, Francisco J.; Mejı́a-López, J.

doi:10.1002/adts.202100307

Cited by 5 publications

(3 citation statements)

References 54 publications

(94 reference statements)

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“…In recent years, layered materials showing moiré patterns have stood as a platform for the exploration of new physics [1][2][3][4][5][6][7][8][9]. Graphene-based materials, such as twisted bilayer graphene (TBG), and transition metal dichalcogenides constitute two families of great interest.…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Moiré Superlattices and Flat Bands in Collapsed Chiral Carbon Nanotubes

et al. 2020

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We demonstrate that one-dimensional moirépatterns, analogous to those found in twisted bilayer graphene, can arise in collapsed chiral carbon nanotubes. Resorting to a combination of approaches, namely, molecular dynamics to obtain the relaxed geometries and tight-binding calculations validated against ab initio modeling, we find that magic angle physics occur in collapsed carbon nanotubes. Velocity reduction, flat bands, and localization in AA regions with diminishing moiréangle are revealed, showing a magic angle close to 1°. From the spatial extension of the AA regions and the width of the flat bands, we estimate that many-body interactions in these systems are stronger than in twisted bilayer graphene. Chiral collapsed carbon nanotubes stand out as promising candidates to explore many-body effects and superconductivity in low dimensions, emerging as the one-dimensional analogues of twisted bilayer graphene.

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Section: Introductionmentioning

confidence: 99%

One-Dimensional Moiré Superlattices and Flat Bands in Collapsed Chiral Carbon Nanotubes

et al. 2020

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“…Within the electronic context, a general theory was landed for twisted graphene in [51]. Recently, the first application of the unified theory to electronic and magnetic multiple twisted layers was studied in [52]. In this work the so-called shiftedrotated BM was proposed.…”

Section: The Square Bm Pcsmentioning

confidence: 99%

Photonic band gaps and waveguide slow-light propagation in Bravais–Moiré two-dimensional photonic crystals

Gómez-Urrea¹,

Cardona²,

Caro-Lopera³

2022

J. Opt.

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Photonic band gap widths and slow-light optical guided modes are theoretically investigated for Bravais-Moiré photonic crystals made of cylindrical dielectric cores which are formed from the combination of two square Bravais lattices. Moiré pattern forms due to a commensurable rotation of one of these lattices with respect to the other. The analysis of gap maps is made versus the radii of dielectric cores -both rotated and unrotated- contained in the Bravais-Moiré unit cell. Guided modes are considered within the framework of coupled-resonator optical waveguides, built from the generation of a point defect chain along the direction of electromagnetic wave propagation. For the analyzed structures, rather wide photonic band gaps were found. It was noticed that changing the core radii can significantly affect the dielectric contrast in the unit cell, leading to wider gaps. In addition, due to the kind of crystal cell structure considered, guided modes with group velocities smaller than those typically observed in photonic crystals with simple square lattices were found for the investigated coupled-resonator optical waveguides.

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“…The magnetic state of a CrI 3 bilayer can be tuned by electric field, [ 15–18 ] external pressure, [ 19–22 ] and charge doping. [ 23–25 ] Theoretical studies have predicted that it also depends on the stacking structure, [ 26–29 ] and a twisting may bring periodic magnetization domains with complex spin texture; [ 30–32 ] additional Dzyaloshinskii–Moriya (DM) interactions may further stabilize various magnetic skyrmions. [ 33–36 ] Rich phase diagrams with noncollinear spin configurations were obtained.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Skyrmion Lattices in a Novel 2D‐Twisted Bilayer Magnet

Zheng

2022

Adv Funct Materials

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Magnetic skyrmions are topologically protected spin swirling vertices, which are promising in device applications due to their particle-like nature and excellent controlability. Magnetic skyrmions are extensively studied in a variety of materials and proposed to exist in the extreme 2D limit, i.e., in twisted bilayer CrI 3 (TBCI). Unfortunately, the magnetic states of TBCIs with small twist angles are disorderly distributed ferromagnetic and antiferromagnetic (AFM) domains in recent experiments, and thus the method to get rid of disorders in TBCIs is highly desirable. Here, intralayer exchange interactions up to the third nearest neighbors without empirical parameters and very accurate interlayer exchange interactions are used to study the magnetic states of TBCIs. The functions of interlayer exchange interactions obtained using first-principles calculations and stored in symmetry-adapted artificial neural networks are proposed. Based on these, the subsequent Landau-Lifshitz-Gillbert equation calculations explain the disorderly distributed FM-AFM domains in TBCIs with small twist angles and predict the orderly distributed skyrmions in TBCIs with large twist angles. This novel twisted 2D bilayer magnet can be used to design memory devices, monochromatic spin wave generators and many kinds of skyrmion lattices.

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Tuning Magnetic Order in CrI3 Bilayers via Moiré Patterns

Cited by 5 publications

References 54 publications

One-Dimensional Moiré Superlattices and Flat Bands in Collapsed Chiral Carbon Nanotubes

One-Dimensional Moiré Superlattices and Flat Bands in Collapsed Chiral Carbon Nanotubes

Photonic band gaps and waveguide slow-light propagation in Bravais–Moiré two-dimensional photonic crystals

Magnetic Skyrmion Lattices in a Novel 2D‐Twisted Bilayer Magnet

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