Spin-valley Hall conductivity of doped ferromagnetic silicene under strain

Shirzadi, Bahram; Yarmohammadi, Mohsen

doi:10.1088/1674-1056/26/1/017203

Cited by 6 publications

(5 citation statements)

References 67 publications

(81 reference statements)

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“…In particular, the experimental realization of silicene [8,9] opens up possibilities for exploring its properties and potential applications. Unlike the flat configuration of graphene, free-standing silicene is not stable in a flat configuration, in which atoms form a slightly buckled monolayer structure because silicon atoms tend to bond in an sp 2 -sp 3 mixing hybridization instead of a pure sp 2 hybridization. [10] Thermoelectric (TE) material is a kind of functional material that can convert heat energy directly into electric energy.…”

Section: Introductionmentioning

confidence: 99%

“…[1] Although graphene is a unique layered material offering many potential novel applications, its compatibility with the existing semiconductor industry still faces severe challenges. Silicene, the counterpart of graphene in the silicon realm has recently attracted great attention in both theory [2][3][4][5] and experiment [6,7] due to its expected compatibility with current silicon technology. In particular, the experimental realization of silicene [8,9] opens up possibilities for exploring its properties and potential applications.…”

Section: Introductionmentioning

confidence: 99%

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Effect of isotope doping on phonon thermal conductivity of silicene nanoribbons: A molecular dynamics study

Xu¹,

Han²,

Li³

2018

Chinese Phys. B

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Silicene, a silicon analogue of graphene, has attracted increasing research attention in recent years because of its unique electrical and thermal conductivities. In this study, phonon thermal conductivity and its isotopic doping effect in silicene nanoribbons (SNRs) are investigated by using molecular dynamics simulations. The calculated thermal conductivities are approximately 32 W/mK and 35 W/mK for armchair-edged SNRs and zigzag-edged SNRs, respectively, which show anisotropic behaviors. Isotope doping induces mass disorder in the lattice, which results in increased phonon scattering, thus reducing the thermal conductivity. The phonon thermal conductivity of isotopic doped SNR is dependent on the concentration and arrangement pattern of dopants. A maximum reduction of about 15% is obtained at 50% randomly isotopic doping with 30 Si. In addition, ordered doping (i.e., isotope superlattice) leads to a much larger reduction in thermal conductivity than random doping for the same doping concentration. Particularly, the periodicity of the doping superlattice structure has a significant influence on the thermal conductivity of SNR. Phonon spectrum analysis is also used to qualitatively explain the mechanism of thermal conductivity change induced by isotopic doping. This study highlights the importance of isotopic doping in tuning the thermal properties of silicene, thus guiding defect engineering of the thermal properties of two-dimensional silicon materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of isotope doping on phonon thermal conductivity of silicene nanoribbons: A molecular dynamics study

Xu¹,

Han²,

Li³

2018

Chinese Phys. B

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“…We aim to modulate the valley dependency of the magnetoconductivity by applying an in-plane electric field. We should mention here that such valley dependent transport can be found in other 2D Dirac materials too [43][44][45][46]. However, in those materials the presence of a strong spin-orbit interaction term removes the spin/valley degeneracy in its band structure.…”

Section: Introductionmentioning

confidence: 70%

Magnetotransport properties of 8-Pmmn borophene: effects of Hall field and strain

Islam

2018

J. Phys.: Condens. Matter

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The polymorph of 8-Pmmn borophene is an anisotropic Dirac material with tilted Dirac cones at two valleys. The tilting of the Dirac cones at two valleys are in opposite directions, which manifests itself via the valley dependent Landau levels in presence of an in-plane electric field (Hall field). The valley dependent Landau levels cause valley polarized magnetotransport properties in presence of the Hall field, which is in contrast to the monolayer graphene with isotropic non-tilted Dirac cones. The longitudinal conductivity and Hall conductivity are evaluated by using linear response theory in low temperature regime. An analytical approximate form of the longitudinal conductivity is also obtained. It is observed that the tilting of the Dirac cones amplifies the frequency of the longitudinal conductivity oscillation (Shubnikov-de Haas). On the other hand, the Hall conductivity exhibits graphene-like plateaus except the appearance of valley dependent steps which are purely attributed to the Hall field induced lifting of the valley degeneracy in the Landau levels. Finally we look into the different cases when the Hall field is applied to the strained borophene and find that valley dependency is fully dominated by strain rather than Hall field. Another noticeable point is that if the real magnetic field is replaced by the strain induced pseudo magnetic field then the electric field looses its ability to cause valley polarized transport.

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“…The static (ω = 0) optical response of silicene in the presence of perpendicular electric and exchange fields has been studied earlier [34]. However, to the best of our knowledge, the dynamic (ω = 0) optical response has not been investigated under both electric and exchange fields.…”

Section: Introductionmentioning

confidence: 98%

Silicene dynamic optical response in the presence of external electric and exchange fields

Mirzaei¹,

Vazifehshenas²,

Salavati-fard³

et al. 2022

J. Phys.: Condens. Matter

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We investigate the dynamic optical transition of monolayer silicene in the presence of external electric and exchange ﬁelds within the low-energy tight-binding model. Applying external electric and exchange ﬁelds breaks the silicene band structure spin and valley degeneracies. Three phases of silicene corresponding to diﬀerent strengths of perpendicular electric ﬁeld with respect to the spin-orbit coupling (∆z < ∆so, ∆z = ∆so and ∆z > ∆so) are considered. We obtain the spinand valley-dependent optical responses to the incoming circularly polarized light using the Kubo formula. We show and discuss how the magnitude and direction of the transverse and longitudinal optical responses of such a system change with the electric and exchange ﬁelds. Our calculations suggest that the intraband part of the longitudinal optical response as well as the initial point of the interband part have strong dependencies on the exchange ﬁeld. Furthermore, we show that one of the spin subbands plays a dominant role in the response to polarized light. Depending on the type of incident light polarization, the dominant subband may change. Our results shed light on the relation between silicene dynamic optical responses and externally applied ﬁelds.

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Spin-valley Hall conductivity of doped ferromagnetic silicene under strain

Cited by 6 publications

References 67 publications

Effect of isotope doping on phonon thermal conductivity of silicene nanoribbons: A molecular dynamics study

Effect of isotope doping on phonon thermal conductivity of silicene nanoribbons: A molecular dynamics study

Magnetotransport properties of 8-Pmmn borophene: effects of Hall field and strain

Silicene dynamic optical response in the presence of external electric and exchange fields

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