Characterization and Manipulation of Intervalley Scattering Induced by an Individual Monovacancy in Graphene

Zhang, Yu; Gao, Fei; Gao, Shiwu; Brandbyge, Mads; He, Lin

doi:10.1103/physrevlett.129.096402

Cited by 10 publications

(10 citation statements)

References 66 publications

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“…The emergence of long-range √3 × √ 3 R 30° electronic density in the graphene honeycomb lattice is further confirmed by Fourier transform (FT) of a large-area topographic image. In the FT image of the STS map, beside the reciprocal lattice of graphene, the reciprocal lattice of WSe 2 , and the reciprocal lattice of the moiré structure in the graphene/WSe 2 heterostructure, we can observe sharp peaks at K points, which arise from the √3 × √ 3 R 30° electronic density (Figure c,d, as observed previously in the graphene induced by an intervalley scattering of atomic defects. − The emergence of √3 × √ 3 R 30° electronic density in the graphene of the graphene/WSe 2 heterostructure is further confirmed by performing high-resolution STS measurements, as shown in Figure e (right middle panel) for a representative STS map of the 49.3° graphene/WSe 2 heterostructure. Obviously, the atomically resolved STM measurements and the long-ranged uniform electronic density reported in this work can help us to completely exclude a scattering of atomic defects or adatoms as the origin of the observed electronic density in the heterostructure.…”

supporting

confidence: 72%

“…In our experiment, the observed robust and long-ranged superperiodicity of electronic density in graphene helps us to remove local defects − or strain , as its origin. The results in Figure demonstrate explicitly that the √3 × √ 3 R 30° superperiodicity in the heterostructures arises from the interlayer coupling between graphene and the TMD substrates.…”

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confidence: 73%

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Observation of Robust and Long-Ranged Superperiodicity of Electronic Density Induced by Intervalley Scattering in Graphene/Transition Metal Dichalcogenide Heterostructures

et al. 2023

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Two-dimensional (2D) h-BN and transition metal dichalcogenides (TMDs) are widely used as substrates of graphene because they are insulating, atomically flat, and without dangling bonds. Usually, it is believed that such insulating substrates will not affect the electronic properties of graphene, especially when the moiré pattern generated between them is quite small. Here, we present a systematic study of the electronic properties of graphene/TMD heterostructures with the period of the moiré pattern <1 nm, and our results reveal an unexpected sensitivity of electronic properties in graphene to the 2D insulating substrates. We demonstrate that there is a robust and long-ranged superperiodicity of electronic density in graphene, which arises from the scattering of electrons between the two valleys of graphene in the graphene/TMD heterostructures. By using scanning tunneling microscope and spectroscopy, three distinct atomic-scale patterns of the electronic density are directly imaged in every graphene/TMD heterostructure.

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confidence: 72%

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confidence: 73%

Observation of Robust and Long-Ranged Superperiodicity of Electronic Density Induced by Intervalley Scattering in Graphene/Transition Metal Dichalcogenide Heterostructures

et al. 2023

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“…The nitrogen-vacancy center magnetometry showed that electron transport was governed by the electron–electron scattering mechanism . The scanning tunneling microscope can image the electronic kagome lattices and the flat bands as well as intervalley scattering of a monovacancy . The electron emission spectra can be recorded by electron statistics detector by irradiating the graphene with highly charged ions .…”

Section: Discussionmentioning

confidence: 99%

“…454 The scanning tunneling microscope can image the electronic kagome lattices 455 and the flat bands 456 as well as intervalley scattering of a monovacancy. 457 The electron emission spectra can be recorded by electron statistics detector by irradiating the graphene with highly charged ions. 458 Besides, surface acoustic waves can induce giant Hall voltage.…”

Section: ■ Conclusionmentioning

confidence: 99%

Applications of Graphene in Five Senses, Nervous System, and Artificial Muscles

et al. 2023

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Graphene remains of great interest in biomedical applications because of biocompatibility. Diseases relating to human senses interfere with life satisfaction and happiness. Therefore, the restoration by artificial organs or sensory devices may bring a bright future by the recovery of senses in patients. In this review, we update the most recent progress in graphene based sensors for mimicking human senses such as artificial retina for image sensors, artificial eardrums, gas sensors, chemical sensors, and tactile sensors. The brain-like processors are discussed based on conventional transistors as well as memristor related neuromorphic computing. The brain−machine interface is introduced for providing a single pathway. Besides, the artificial muscles based on graphene are summarized in the means of actuators in order to react to the physical world. Future opportunities remain for elevating the performances of human-like sensors and their clinical applications.

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“…The possible explanation for the suppression of the replica Dirac cone could be the large number of extra scattering defects induced by potassium deposition, which drive the system out of the coherent ordered ground state. In fact, potassium doping can effectively suppress intervalley scattering in graphene when defects/impurities are charged. ,, …”

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confidence: 99%

Observation of a Folded Dirac Cone in Heavily Doped Graphene

Wang

et al. 2023

J. Phys. Chem. Lett.

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Superlattice potentials imposed on graphene can alter its Dirac states, enabling the realization of various quantum phases. We report the experimental observation of a replica Dirac cone at the Brillouin zone center induced by a superlattice in heavily doped graphene with Gd intercalation using angle-resolved photoemission spectroscopy (ARPES). The replica Dirac cone arises from the (√3× √3)R30°superlattice formed by the intervalley coupling of two nonequivalent valleys (e.g., the Kekule-like distortion phase), accompanied by a bandgap opening. According to the findings, the replica Dirac band in Gd-intercalated graphene disappears beyond a critical temperature of 30 K and can be suppressed by potassium adsorption. The modulation of the replica Dirac band is primarily attributable to the residual frozen gas, which can act as a source of intervalley scattering at temperatures below 30 K. Our results highlight the persistence of the hidden Kekule-like phase within the heavily doped graphene, enriching our current understanding of its replica Dirac Fermions.

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Characterization and Manipulation of Intervalley Scattering Induced by an Individual Monovacancy in Graphene

Cited by 10 publications

References 66 publications

Observation of Robust and Long-Ranged Superperiodicity of Electronic Density Induced by Intervalley Scattering in Graphene/Transition Metal Dichalcogenide Heterostructures

Observation of Robust and Long-Ranged Superperiodicity of Electronic Density Induced by Intervalley Scattering in Graphene/Transition Metal Dichalcogenide Heterostructures

Applications of Graphene in Five Senses, Nervous System, and Artificial Muscles

Observation of a Folded Dirac Cone in Heavily Doped Graphene

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