Pure valley-polarized current in graphene junction induced by circularly polarized light and carrier mass

Chang, Lulu; Wu, Qing‐Ping; Yu-zeng, LI; Zhang, Ruo-Long; Liu, Meirong; Li, Wanying; Liu, Feifei; Xiao, Xunwen; Liu, Zhengfang

doi:10.1016/j.physe.2021.114681

Cited by 7 publications

(2 citation statements)

References 30 publications

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“…In addition, there is an offresonant circularly polarized light field perpendicular to the barrier region. [36] The low-energy effective Hamiltonian is expressed as [32,37]…”

Section: Model and Formalismmentioning

confidence: 99%

“…[30] Recently, it has been shown that a valley-dependent energy gap [31] can be opened in the presence of both circularly polarized light and mass term. [32] The mass term can induce a sublattice symmetry breaking. [33] The configuration of ferromagnetic insulator (FI) deposited directly on top of graphene can induce exchange splitting, which is used to eliminate spin degeneracy.…”

Section: Introductionmentioning

confidence: 99%

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Spin- and valley-polarized Goos–Hänchen-like shift in ferromagnetic mass graphene junction with circularly polarized light

Liu

Zhang

et al. 2023

Chinese Phys. B

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We investigated the band structure and Goos-Hänchen-Like shift in ferromagnetic mass graphene junction modulated by the circularly polarized light. It is found that both spin and valley-related energy gaps can be opened by employing the circularly polarized light and exchange fields in mass graphene. The valley-polarized Goos-Hänchen-Like shift can be identified in the presence of the circularly polarized light, and the spin-polarized Goos-Hänchen-Like shift can be realized with the introduction of an exchange field in mass graphene. Furthermore, the spin and valley polarization-related Goos-Hänchen-Like shift can be achieved with the combination of the circularly polarized light and exchange field in mass graphene. We hope that our work will be more conducive for future applications in graphene polarization transport devices.

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“…In addition, there is an offresonant circularly polarized light field perpendicular to the barrier region. [36] The low-energy effective Hamiltonian is expressed as [32,37]…”

Section: Model and Formalismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spin- and valley-polarized Goos–Hänchen-like shift in ferromagnetic mass graphene junction with circularly polarized light

Liu

Zhang

et al. 2023

Chinese Phys. B

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Valley polarization of electrons in a graphene under modulations of the electrostatic potential barrier and the magnetic field

Luo,

Lu,

et al. 2024

Indian J Phys

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Retro and specular Andreev reflections and valley-spin switching effect in graphene superconducting heterojunction

Liu

et al. 2023

Journal of Applied Physics

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We investigated Andreev reflection of graphene-based normal/superconductor single and double junctions under the modulation of non-resonant circularly polarized light, staggered potential, and exchange field. In the graphene-based normal/superconductor single junction, we discovered that the circularly polarized light can adjust the bandgap of retro Andreev reflection and specular Andreev reflection. The exchange field can change the position of the transition point between retro Andreev reflection and specular Andreev reflection. In the graphene-based normal/superconductor/normal double junction, when the light field is modulated from left circularly polarized light to right circularly polarized light, the valley-spin switching effect between pure elastic co-tunneling and pure crossed Andreev reflection can be realized. By changing the exchange field, we achieved the conversion of non-local transport between pure elastic co-tunneling and pure crossed Andreev reflection. In addition, the energy location and range of crossed Andreev reflection and elastic co-tunneling can be controlled by the staggered potential and the exchange field. Our results suggest that the device can implement light and exchange field control of the Andreev reflection process and the spin-valley switch.

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Pure valley-polarized current in graphene junction induced by circularly polarized light and carrier mass

Cited by 7 publications

References 30 publications

Spin- and valley-polarized Goos–Hänchen-like shift in ferromagnetic mass graphene junction with circularly polarized light

Spin- and valley-polarized Goos–Hänchen-like shift in ferromagnetic mass graphene junction with circularly polarized light

Valley polarization of electrons in a graphene under modulations of the electrostatic potential barrier and the magnetic field

Retro and specular Andreev reflections and valley-spin switching effect in graphene superconducting heterojunction

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