Valley filtering in graphene under a magnetic proximity

Zheng, Jianlong; Lu, Junqiang; Zhai, Feng

doi:10.1103/physrevb.105.165410

Cited by 4 publications

(2 citation statements)

References 57 publications

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“…We study the valley-dependent electron transport properties of graphene in proximity to the FI EuO. [62] A metallic gate on top of the thick EuO layer is used to create an electrostatic potential with height U F .…”

Section: Valley Filtering Due To Magnetic Proximitymentioning

confidence: 99%

“…[59] For graphene under the proximity of some magnetic substrates, several interesting properties were discussed, including universal valley Hall conductivity, [60] valley-contrasting quantum anomalous Hall effect, [61] and valley filtering. [62] For graphene modulated by patterned dielectric superlattices, [63] Dirac gap was found by using an unfolding procedure, which leads to a robust transverse valley current against irregularities in the patterned dielectric. [64] In graphene-based devices with spatially varying regions of staggered potential, Aktor et al reported [65] the emergence of valley-polarized bulk currents and nonlocal resistance fingerprints, which are robust against disorder.…”

Section: Introductionmentioning

confidence: 99%

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Valley filtering and valley-polarized collective modes in bulk graphene monolayers

Zheng 郑,

Zhai 翟

2024

Chinese Phys. B

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The presence of two sublattices in hexagonal graphene brings two energetically degenerate extremes in the conduction and valence band, which are identified by the valley quantum number. Recently, this valley degree of freedom has been suggested to encode and process information, which develops a new carbon-based electronics named graphene valleytronics. In this topical review, we present and discuss valley-related transport properties in bulk graphene monolayers, which are due to strain-induced pseudomagnetic fields and associated vector potential, sublattice-stagger potential, and the valley-Zeeman effect. These valley-related interactions can be utilized to obtain valley filtering, valley spatial separation, valley-resolved guiding modes, and valley-polarized collective modes such as edge or surface plasmons. The present challenges and the perspectives on graphene valleytronics are also provided in this review.

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Section: Valley Filtering Due To Magnetic Proximitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Valley filtering and valley-polarized collective modes in bulk graphene monolayers

Zheng 郑,

Zhai 翟

2024

Chinese Phys. B

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Design of graphene spin beam splitter based on Brewster’s law

Yang

Chen

Zhang

et al. 2023

Journal of Applied Physics

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Spin beam splitter is one of the building blocks of graphene spintronics. Here, we adopt the concept of electron optics and design a new type of spin beam splitter by analogy with Brewster’s law. The device is a pristine/ferromagnetic/pristine (P/M/P) graphene junction, where the M region is formed by a proximity effect of ferromagnetic insulators, such as EuO, and acts as an “optically thinner medium” relative to the P region. It is found that, when standing waves are formed in the M region with a length of integral multiple of the half longitudinal wavelength of electrons, electrons with the corresponding spin can pass completely through the junction and only electrons with the other spin are reflected by the P/M interface. This manifests Brewster’s law and a spin beam splitter. It is also demonstrated that, due to the strong electric field effect of graphene, the Brewster angles for both spins can be monotonically modulated by a gate voltage in the M region in the whole range of [Formula: see text]. Thus, our proposed spin beam splitter is not only an easily implemented and widely tunable build block for spintronics but also an interesting demonstration of electron optics.

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Valley filtering in black phosphorus nanofilms under a magnetic-electric barrier

Chen,

Zhai

2023

Phys. Rev. B

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Valley filtering in graphene under a magnetic proximity

Cited by 4 publications

References 57 publications

Valley filtering and valley-polarized collective modes in bulk graphene monolayers

Valley filtering and valley-polarized collective modes in bulk graphene monolayers

Design of graphene spin beam splitter based on Brewster’s law

Valley filtering in black phosphorus nanofilms under a magnetic-electric barrier

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