Chiral Decomposition of Twisted Graphene Multilayers with Arbitrary Stacking

Zhang, Sheng Nan; Xie, Bo; Wu, Quansheng; Liu, Jianpeng; Yazyev, Oleg V.

doi:10.1021/acs.nanolett.3c00275

Cited by 13 publications

(4 citation statements)

References 47 publications

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“…Apart from strong correlations in twisted graphene heterobilayer superlattices, an infinite class of multilayer graphene systems has been theoretically predicted to harbour flat bands at specific magic angles [74,75,[116][117][118][119][120][121]. These systems are known as alternating twisted multilayer graphene since the relative twists between two neighbouring layers have the same magnitude, but alternate in sign (figure 5(e)).…”

Section: Twisted Multilayer Graphenementioning

confidence: 99%

Emergent phases in graphene flat bands

Bhowmik,

Ghosh,

Chandni

2024

Rep. Prog. Phys.

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Electronic correlations in two-dimensional materials play a crucial role in stabilising emergent phases of matter. The realisation of correlation-driven phenomena in graphene has remained a longstanding goal, primarily due to the absence of strong electron-electron interactions within its low-energy bands. In this context, magic-angle twisted bilayer graphene has recently emerged as a novel platform featuring correlated phases favoured by the low-energy flat bands of the underlying moiré superlattice. Notably, the observation of correlated insulators and superconductivity has garnered significant attention, leading to substantial progress in theoretical and experimental studies aiming to elucidate the origin and interplay between these two phases. A wealth of correlated phases with unprecedented tunability was discovered subsequently, including orbital ferromagnetism, Chern insulators, strange metallicity, density waves, and nematicity. However, a comprehensive understanding of these closely competing phases remains elusive. The ability to controllably twist and stack multiple graphene layers has enabled the creation of a whole new family of moiré superlattices with myriad properties being discovered at a fast pace. Here, we review the progress and development achieved so far, encompassing the rich phase diagrams offered by these graphene-based moiré systems. Additionally, we discuss multiple phases recently observed in non-moiré multilayer graphene systems. Finally, we outline future opportunities and challenges for the exploration of hidden phases in this new generation of moiré materials.

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Section: Twisted Multilayer Graphenementioning

confidence: 99%

Emergent phases in graphene flat bands

Bhowmik,

Ghosh,

Chandni

2024

Rep. Prog. Phys.

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“…14−16 The latter breaks the material limitations that principally any materials, organic or inorganic, conductor, semiconductor, or even insulator can be effective candidates. It brings about opportunities of converting achiral photodetective materials into chiral counterparts by various methods such as CPL irradiation, 17,18 templating, 19,20 grazing angle deposition, 21−24 laser direct writing, 25 electron beam lithography, 15,26 chiral molecule induced nanocrystal synthesis, 27,28 or film growth. 29−31 Among the chiral candidates, inorganic semiconducting materials may have a tunable band structure, higher carrier mobility, and good stability, making them suitable for building high-performance CPL photodetectors.…”

Section: Introductionmentioning

confidence: 99%

“…These materials could be chiral molecules, chiral polymers, or crystals with structures of chiral space groups, e.g., chiral perovskites. − The other is to build the chiral layer from intrinsically achiral structured materials by constructing the chiral shape, pattern, morphology, or assembly in the feature size from nanometer to micrometer scales. − The latter breaks the material limitations that principally any materials, organic or inorganic, conductor, semiconductor, or even insulator can be effective candidates. It brings about opportunities of converting achiral photodetective materials into chiral counterparts by various methods such as CPL irradiation, , templating, , grazing angle deposition, − laser direct writing, electron beam lithography, , chiral molecule induced nanocrystal synthesis, , or film growth. − Among the chiral candidates, inorganic semiconducting materials may have a tunable band structure, higher carrier mobility, and good stability, making them suitable for building high-performance CPL photodetectors. , …”

Section: Introductionmentioning

confidence: 99%

Chiral ZnO-CuO Nanorod Arrays for Circularly Polarized Photodetection

Hu,

Chen,

Sheng

et al. 2024

ACS Appl. Nano Mater.

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Circularly polarized light (CPL) photodetectors have attracted widespread interest from both the academic and industrial communities. Commonly, the key function layer of a film structured CPL photodetector is the chiral material layer that exhibits optoelectronic response differently to the left-handed and right-handed circularly polarized light. In this report, the heterostructured chiral ZnO-CuO nanorod arrays were successfully prepared by a strategy of combining the solution synthesis of ZnO nanorod arrays, grazing angle magnetron sputtering of Cu, and a thermal oxidation process. The chirality of left-/right-handedness was controlled by the sputtering angles and rotating direction. The morphology of nanorod arrays benefits light scattering and hence the absorption. The band structure of the ZnO-CuO heterojunction facilitates carrier transfer and transport. The CPL photodetectors based on the chiral ZnO-CuO nanorod arrays exhibit good performance with a responsivity (R), photocurrent asymmetry factor (g Iph), responsivity asymmetry factor (g res), and photodetectivity (D*) of 13.0 mA/W, 0.038, 0.22, and 8.3 × 1011 Jones achieved, respectively, under the 450 nm circular polarized light.

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“…The interacting effects in such systems are under persistent theoretical investigation [47][48][49]. Other twisted graphene multilayer systems were discussed theoretically [50][51][52][53][54][55] and realized experimentally [56][57][58] where similar interacting effects were discovered.…”

Section: Introductionmentioning

confidence: 99%

Magic Angles In Equal-Twist Trilayer Graphene

Popov¹,

Tarnopolsky²

2023

Preprint

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We consider a configuration of three stacked graphene monolayers with equal consecutive twist angles θ. Remarkably, in the chiral limit when interlayer coupling terms between AA sites of the moiré pattern are neglected we find four perfectly flat bands (for each valley) at a sequence of magic angles which are exactly equal to the twisted bilayer graphene (TBG) magic angles divided by √ 2. Therefore, the first magic angle for equal-twist trilayer graphene (eTTG) in the chiral limit is θ * ≈ 1.05 • / √ 2 ≈ 0.74 • . We prove this relation analytically and show that the Bloch states of the eTTG's flat bands are non-linearly related to those of TBG's. Additionally, we show that at the magic angles, the upper and lower bands must touch the four exactly flat bands at the Dirac point of the middle graphene layer. Finally, we explore the eTTG's spectrum away from the chiral limit through numerical analysis.

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Chiral Decomposition of Twisted Graphene Multilayers with Arbitrary Stacking

Cited by 13 publications

References 47 publications

Emergent phases in graphene flat bands

Emergent phases in graphene flat bands

Chiral ZnO-CuO Nanorod Arrays for Circularly Polarized Photodetection

Magic Angles In Equal-Twist Trilayer Graphene

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