Strong Interminivalley Scattering in Twisted Bilayer Graphene Revealed by High-Temperature Magneto-Oscillations

Phinney, Isabelle; Bandurin, Denis; Collignon, Clément; Дмитриев, И. А.; Taniguchi, Takashi; Watanabe, Kenji; Jarillo‐Herrero, Pablo

doi:10.1103/physrevlett.127.056802

Cited by 15 publications

(8 citation statements)

References 50 publications

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“…Related to our result, interminivalley scattering was studied by measurement of high-temperature magnetooscillations in recent studies, 31,32) and strong interminivalley scattering was observed. 31) According to the result, the intervalley and intravalley scattering times were of similar order in the small-angle TBG with θ = 1.65°. This agrees with our result that the intervalley and intravalley scattering times become close to comparable values as the twist angle decreases.…”

supporting

confidence: 82%

Weak localization on moiré superlattice in twisted double bilayer graphene

Kashiwagi

Taen

Uchida

et al. 2022

Jpn. J. Appl. Phys.

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Negative magnetoresistance owing to weak localization (WL) was investigated in twisted double bilayer graphene (TDBG) as a function of the twist angle. The ratio of the intervalley scattering time to the intravalley scattering time, estimated using the WL formula for bilayer graphene, tended to decrease as the twist angle increased. This feature is qualitatively explained by the enhancement of intervalley scattering due to the reduction of the intervalley distance in the moiré Brillouin zone (BZ). This indicates that WL in the TDBG occurs with the reconstructed BZ and originates from the scattering process owing to the disorder in moiré superlattice.

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supporting

confidence: 82%

Weak localization on moiré superlattice in twisted double bilayer graphene

Kashiwagi

Taen

Uchida

et al. 2022

Jpn. J. Appl. Phys.

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“…This contrasts with the slowly varying background ( B F ∼ 30 T ), attributed to the K s – K s ′ Shubnikov–De Haas oscillations, whose phase reverts as a function of D as the charge distribution in the two layers is modified. Recently discovered D -dependent high-temperature oscillations from interminivalley scattering are not observable in our current set of data.…”

contrasting

confidence: 68%

Moiré-Induced Transport in CVD-Based Small-Angle Twisted Bilayer Graphene

et al. 2022

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To realize the applicative potential of 2D twistronic devices, scalable synthesis and assembly techniques need to meet stringent requirements in terms of interface cleanness and twist-angle homogeneity. Here, we show that small-angle twisted bilayer graphene assembled from separated CVD-grown graphene single-crystals can ensure high-quality transport properties, determined by a device-scale-uniform moiré potential. Via low-temperature dual-gated magnetotransport, we demonstrate the hallmarks of a 2.4°-twisted superlattice, including tunable regimes of interlayer coupling, reduced Fermi velocity, large interlayer capacitance, and density-independent Brown-Zak oscillations. The observation of these moiré-induced electrical transport features establishes CVD-based twisted bilayer graphene as an alternative to “tear-and-stack” exfoliated flakes for fundamental studies, while serving as a proof-of-concept for future large-scale assembly.

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“…In a long-wavelength moiré, the two valleys contribute to the layer Hall conductivity with identical sign and magnitude [see Eq. (7)], therefore intervalley scattering in tBG 33 is not expected to diminish the effect. When the twist angle gets large enough, Umklapp process becomes important 34 , 35 , and can hybridize the two valleys and lead to new features in the layer Hall conductivity that are not expected from the continuum model.…”

Section: Resultsmentioning

confidence: 99%

Time-reversal even charge hall effect from twisted interface coupling

et al. 2023

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Under time-reversal symmetry, a linear charge Hall response is usually deemed to be forbidden by the Onsager relation. In this work, we discover a scenario for realizing a time-reversal even linear charge Hall effect in a non-isolated two-dimensional crystal allowed by time reversal symmetry. The restriction by Onsager relation is lifted by interfacial coupling with an adjacent layer, where the overall chiral symmetry requirement is fulfilled by a twisted stacking. We reveal the underlying band geometric quantity as the momentum-space vorticity of layer current. The effect is demonstrated in twisted bilayer graphene and twisted homobilayer transition metal dichalcogenides with a wide range of twist angles, which exhibit giant Hall ratios under experimentally practical conditions, with gate voltage controlled on-off switch. This work reveals intriguing Hall physics in chiral structures, and opens up a research direction of layertronics that exploits the quantum nature of layer degree of freedom to uncover exciting effects.

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Strong Interminivalley Scattering in Twisted Bilayer Graphene Revealed by High-Temperature Magneto-Oscillations

Cited by 15 publications

References 50 publications

Weak localization on moiré superlattice in twisted double bilayer graphene

Weak localization on moiré superlattice in twisted double bilayer graphene

Moiré-Induced Transport in CVD-Based Small-Angle Twisted Bilayer Graphene

Time-reversal even charge hall effect from twisted interface coupling

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