Strong gate-tunability of flat bands in bilayer graphene due to moiré encapsulation between hBN monolayers

Robin, Smeyers,; Miloševıć, M. V.; Covaci, Lucian

doi:10.1039/d2nr07171a

Cited by 3 publications

(2 citation statements)

References 47 publications

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“…Bilayer systems are of great interest as they offer additional control over properties compared to monolayers, through the interlayer interactions which can be tuned via stacking orientation, interlayer spacing, external electric fields, etc. 51 – 53 . In this paper, we investigate the phonon dispersion, electronic, and optical properties of bilayer BAs under strain, which has not been done before.…”

Section: Introductionmentioning

confidence: 99%

Investigation of effects of interlayer interaction and biaxial strain on the phonon dispersion and dielectric response of hexagonal boron arsenide

Behzad,

Chegel

2023

Sci Rep

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In this study, the effects of interlayer interaction and biaxial strain on the electronic structure, phonon dispersion and optical properties of monolayer and bilayer BAs are studied, using first-principles calculations within the framework of density functional theory. The interlayer coupling in bilayer BAs causes the splitting of out-of-plane acoustic (ZA) and optical (ZO) mode. For both structures, positive phonon modes across the Brillouin zone have been observed under biaxial tensile strain from 0 to 8%, which indicate their dynamical stability under tensile strain. Also, the phonon band gap between longitudinal acoustic (LA) and longitudinal optical (LO)/transverse optical (TO) modes for monolayer and bilayer BAs decreases under tensile strain. An appreciable degree of optical anisotropy is noticeable in the materials for parallel and perpendicular polarizations, accompanied by significant absorption in the ultraviolet and visible regions. The absorption edge of bilayer BAs is at a lower energy with respect to the monolayer BAs. The results demonstrate that the phonon dispersion and optoelectronic properties of BAs sheet could as well be tuned with both interlayer interaction and biaxial strain that are promising for optoelectronic and thermoelectric applications.

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Section: Introductionmentioning

confidence: 99%

Investigation of effects of interlayer interaction and biaxial strain on the phonon dispersion and dielectric response of hexagonal boron arsenide

Behzad,

Chegel

2023

Sci Rep

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“…This is a noteworthy advancement in the field [16,33,34]. The atomic and electronic structure of vdW heterostructures is subject to periodic modulation by Moiré superlattices (MSLs), leading to the appearance of several phenomena such as the formation of shear solitons and topological point defects [35][36][37][38], secondary Dirac cones [39][40][41], and Hofstadter butterfly states [33,[42][43][44]. In addition, flat bands were discussed back in 2011; such flat energy bands are of interest and may localize the presence of electronic states.…”

Section: Introductionmentioning

confidence: 99%

Emerging Characteristics and Properties of Moiré Materials

Wang,

Song,

Sun

et al. 2023

Nanomaterials

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In recent years, scientists have conducted extensive research on Moiré materials and have discovered some compelling properties. The Moiré superlattice allows superconductivity through flat-band and strong correlation effects. The presence of flat bands causes the Moiré material to exhibit topological properties as well. Modulating electronic interactions with magnetic fields in Moiré materials enables the fractional quantum Hall effect. In addition, Moiré materials have ferromagnetic and antiferromagnetic properties. By tuning the interlayer coupling and spin interactions of the Moiré superlattice, different magnetic properties can be achieved. Finally, this review also discusses the applications of Moiré materials in the fields of photocurrent, superconductivity, and thermoelectricity. Overall, Moiré superlattices provide a new dimension in the development of two-dimensional materials.

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Moiré fractals in twisted graphene layers

Aggarwal,

Narula,

Ghosh

2024

Phys. Rev. B

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Strong gate-tunability of flat bands in bilayer graphene due to moiré encapsulation between hBN monolayers

Abstract: When using hexagonal boron-nitride (hBN) as a substrate for graphene, the resulting moiré pattern creates secondary Dirac points. By encapsulating a multilayer graphene within aligned hBN sheets the controlled moiré...

Cited by 3 publications

References 47 publications

Investigation of effects of interlayer interaction and biaxial strain on the phonon dispersion and dielectric response of hexagonal boron arsenide

Investigation of effects of interlayer interaction and biaxial strain on the phonon dispersion and dielectric response of hexagonal boron arsenide

Emerging Characteristics and Properties of Moiré Materials

Moiré fractals in twisted graphene layers

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