Twistronics versus straintronics in twisted bilayers of graphene and transition metal dichalcogenides

Mannaï, Marwa; Haddad, S.

doi:10.1103/physrevb.103.l201112

Cited by 27 publications

(19 citation statements)

References 66 publications

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“…In this section we explore the origin of large BCD in graphene based moiré systems, in vicinity of the charge neutrality point. For that we calculate Berry curvature dipole for a low energy tilted massive Dirac model and extend it to strained two band model of twisted bilayer graphene [40].…”

Section: Sign Reversal Of Berry Curvature Dipole Across the Topologic...mentioning

confidence: 99%

“…The low energy mode for strained twisted bilayer graphene given, in vicinity of the charge neutrality point, is given by [40]…”

Section: Sign Reversal Of Berry Curvature Dipole Across the Topologic...mentioning

confidence: 99%

“…High BCD magnitude has been theoretically predicted in strained twisted systems [15,23,[30][31][32]. The origin of high BCD in graphene-based moiré systems, in the vicinity of the charge neutrality point, can be understood using the model of strained twisted bilayer graphene as a tilted Dirac system [40]. In this model, BCD ∝ t ∝ λ 3 , where t is the tilt parameter and λ is the moiré wavelength.…”

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confidence: 99%

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Berry curvature dipole senses topological transition in a moiré superlattice

Sinha,

Adak,

Chakraborty

et al. 2022

Preprint

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Section: Sign Reversal Of Berry Curvature Dipole Across the Topologic...mentioning

confidence: 99%

“…The low energy mode for strained twisted bilayer graphene given, in vicinity of the charge neutrality point, is given by [40]…”

Section: Sign Reversal Of Berry Curvature Dipole Across the Topologic...mentioning

confidence: 99%

mentioning

confidence: 99%

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Berry curvature dipole senses topological transition in a moiré superlattice

Sinha,

Adak,

Chakraborty

et al. 2022

Preprint

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“…Despite the magnetic effects on moiré superlattices not being extensively explored, our results agree with previous studies indicating that changes in the neighborhoods and relaxation mechanisms play a key role in modifying the electronic and structural properties of graphene [30][31][32][33][34] and metal dichalcogenide systems. [35][36][37][38]…”

Section: Structural and Magnetic Propertiesmentioning

confidence: 99%

Tuning Magnetic Order in CrI3 Bilayers via Moiré Patterns

León

Velásquez

Caro-Lopera

et al. 2022

Advcd Theory and Sims

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Commensurable twisted bilayers can drastically change the magnetic properties of chromium trihalide layered compounds, which opens novel opportunities for tuning magnetic states through layer rotations. Here, a mathematical approach to obtain moiré patterns in twisted hexagonal bilayers by performing a certain commensurable rotation 𝜽 over one layer is presented. To test the approach, moiré structures with 𝜽 = 21.79 • and 32.20 • in the phases R 3 and C2/m of CrI 3 are obtained via the related methodology. For comparison purposes, a non-shifted CrI 3 structure is also considered. Electronic and magnetic properties of the so-obtained systems are computed by ab initio methodologies. Results show the presence of rotation-angle-dependent magnetic configurations and steep modifications of the dispersion bands due to variations in the nearest and next nearest distances among layers of Cr atoms. Modifications obtained from these commensurable rotations are discussed on the basis of competition among different energy contributions due to changes in the atomic neighborhood.

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“…Our bands cutoff calculation can be related to those performed in the frame of an effective low energy model that only considers specific number of electronic bands. Thus, one should be careful to use developed effective models to investigate plasmons in tb-TMD 21,74,75 .…”

Section: Band Cutoff and Doping Effectmentioning

confidence: 99%

Flat-band plasmons in twisted bilayer transition metal dichalcogenides: twist angle, relaxation and band cutoff effects

Kuang,

Zhan,

Yuan

2021

Preprint

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Twisted bilayer transition metal dichalcogenides are ideal platforms to study flat-band phenomena. In this paper, we investigate flat-band plasmons in doped twisted bilayer MoS2 by employing a full tight-binding model and the random phase approximation. Twist-angle effects on flat-band plasmons in twisted bilayer MoS2 show that plasmons at a smaller angle exhibit lower energy due to a flatter band, which is similar to the twisted bilayer graphene case. Besides, effects of band cutoff and doping on plasmons are studied. We find that, in relaxed samples, low-damped and quasi-flat plasmons emerge only in one-band calculation where merely intraband transitions in the doped flat band are considered, whereas classical plasmons of two dimensional electron gas emerge in multi-band calculations. In rigid samples that possess isolated flat bands, classical and quasi-flat plasmons appear in both slightly-doped and highly-doped cases. So one-band calculation is only accurate in system with isolated flat bands. Especially, isolation of the flat band from its adjacent bands is essential to observe a low-damped and quasi-flat plasmon mode. On the contrary, for relaxed samples, contribution of interband transitions between flat band and other bands to plasmons makes a significant influence in transforming plasmons dispersion and energy. We hope that our study on flat-band plasmons can be instructive for studying other twisted systems with flat bands.

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Twistronics versus straintronics in twisted bilayers of graphene and transition metal dichalcogenides

Cited by 27 publications

References 66 publications

Berry curvature dipole senses topological transition in a moiré superlattice

Berry curvature dipole senses topological transition in a moiré superlattice

Tuning Magnetic Order in CrI3 Bilayers via Moiré Patterns

Flat-band plasmons in twisted bilayer transition metal dichalcogenides: twist angle, relaxation and band cutoff effects

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