Valley polarization transition driven by biaxial strain in Janus GdClF monolayer

Guo, San‐Dong; Guo, Xiao-Shu; Cai, Xiuxia; Liu, Bang-Gui

doi:10.1039/d1cp05337j

Cited by 30 publications

(35 citation statements)

References 54 publications

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“…In addition, the GdClF monolayer is also a potential ferrovalley material. 52 Although its valley splitting is only -3.1 meV, the valley polarization can be effectively modulated by biaxial strain.…”

Section: Janus Monolayer Based On Gadolinium Dihalidementioning

confidence: 99%

“…Simultaneously, the strain change from a compressive to a tensile strain can reverse the direction of in-plane piezoelectric polarization (Figure 3e), supplying the probability for a combination of valley properties and piezoelectricity. 52…”

Section: Janus Monolayer Based On Gadolinium Dihalidementioning

confidence: 99%

“…[46][47][48][49][50] The second part will recall Gd dihalide based Janus monolayers, including GdClF, GdBrCl, GdICl and GdIBr. 51,52 The third part will introduce 2D GdI3 and GdCl3 monolayers, as well as their variants with metal atom intercalation. 53,54 It is noteworthy that the 4f and 5d orbitals of Gd both play crucial roles in these materials.…”

Section: Introductionmentioning

confidence: 99%

“…In the following, this review is divided into three parts. The first part will describe the studies on 2D FM GdX 2 (X = I, Br, Cl, F). − The second part will recall Gd dihalide based Janus monolayers, including GdClF, GdBrCl, GdICl, and GdIBr. , The third part will introduce 2D GdI 3 and GdCl 3 monolayers, as well as their variants with metal atom intercalation. , It is noteworthy that the 4f and 5d orbitals of Gd both play crucial roles in these materials. For GdX 2 and related Janus monolayers, the spatially expanded 5d electrons act as a bridge to couple localized 4f spins, and their 4f 7 + 5d 1 hybridization of Gd 2+ leads to large exchange interactions, as illustrated in Figures a,b.…”

Section: Introductionmentioning

confidence: 99%

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Gadolinium Halide Monolayers: A Fertile Family of Two-Dimensional 4f Magnets

You

Ding

Yao

et al. 2022

ACS Appl. Electron. Mater.

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Two-dimensional (2D) magnets have great potentials for applications in nextgeneration information devices. Since the recent experimental discovery of intrinsic 2D magnetism in monolayer CrI3 and few-layer Cr2Ge2Te6, intensive studies have been stimulated in pursuing more 2D magnets and revealing their intriguing physical properties. In comparison to the magnetism based on 3d electrons, 4f electrons can provide larger magnetic moments and stronger spin-orbit coupling, but have been much less studied in the 2D forms. Only in very recent years, some exciting results have been obtained in this area. In this mini-review, we will introduce some recent progress in 2D Gd halides from a theoretical aspect. It is noteworthy that 4f and 5d orbitals of Gd both play key roles in these materials. For GdX2 (X=I, Br, Cl and F) monolayers and related Janus monolayers, robust ferromagnetism with large exchanges comes from the 4f 7 + 5d 1 hybridization of Gd 2+ . The spatially expanded 5d electrons act as a bridge to couple localized 4f spins. For GdX3 monolayers, the intercalation of metal atoms can dope electrons into Gd's 5d orbitals, which leads to numerous intriguing physical properties, such as ferroelasticity, ferromagnetism, and anisotropic conductance. In brief, Gd halides establish an effective strategy to take advantage of f-electron magnetism in 2D materials.

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Section: Janus Monolayer Based On Gadolinium Dihalidementioning

confidence: 99%

Section: Janus Monolayer Based On Gadolinium Dihalidementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Gadolinium Halide Monolayers: A Fertile Family of Two-Dimensional 4f Magnets

You

Ding

Yao

et al. 2022

ACS Appl. Electron. Mater.

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“…Among them, MoX 2 and WX 2 (X=S, Se, Te) are the most famous, and they have been explored intensively and various interesting devise have been realized from them [4][5][6][7][8][9][10] . In addition, transition metal can be replaced by rare earth atoms and chalcogen by halogens in these 2D structures, producing various interesting 2D materials [11][12][13][14] . On the other hand, 2D VX 2 (X=S, Se, Te) become very attractive.…”

Section: Introductionmentioning

confidence: 99%

Possible structural and bond reconstruction in 2D ferromagnetic semiconductor VSe2 under uniaxial stress

Yu¹,

Liu²

2022

Preprint

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Two-dimensional (2D) semiconducting transition metal dichalcogenides have been used to make high-performance electronic, spintronic, and optoelectronic devices. Recently, room-temperature ferromagnetism and semiconducting property were found in 2D VSe2 nanoflakes (mechanically exfoliated onto silicon substrates capped with a oxide layer) and are attributed to the stable 2H-phase of VSe2 in the 2D limit. Here, our first-principles investigation show that a metastable semiconducting H' phase can be formed from the H VSe2 monolayer and some other similar when these 2D H-phase materials are under uniaxial stress or uniaxial strain. For the uniaxial stress (uniaxial strain) scheme, the H' phase will become lower in total energy than the H phase at the transition point. The calculated phonon spectra indicate the dynamical stability of the H' structures of VSe2, VS2, and CrS2, and the path of phase switching between the H and H' VSe2 phases is calculated. For VSe2, the H' phase has stronger ferromagnetism and its Currier temperature can be substantially enhanced by applying uniaxial stress or strain. Spin-resolved electronic structures, energy band edges, and effective carrier masses for both of the H and H' phases can be substantially changed by the applied uniaxial stress or strain, leading to huge effective masses near the band edge of the strained H' phase. Analysis indicated that the largest bond length difference between the H' and H phases can reach -19% for the Se3-Se3' bond, and there is noticeable covalence for the Se3-Se3' bond, which switches the valence of the nearby V atoms, leading to the enhanced ferromagnetism. Therefore, structural and bond reconstruction can be realized by applying uniaxial stress in 2D ferromagnetic H VSe2 and some other similar. These can be useful to seeking more insights and phenomena in such 2D materials for potential applications.

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First-principles study of the valley-polarized quantum anomalous Hall effect in TiBrTe monolayers

Wan,

Zhou,

et al. 2024

Chinese Journal of Physics

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Valley polarization transition driven by biaxial strain in Janus GdClF monolayer

Abstract: The valley degrees of freedom of carriers in crystals is useful to process information and perform logic operations, and it is a key factor for valley application to realize the...

Cited by 30 publications

References 54 publications

Gadolinium Halide Monolayers: A Fertile Family of Two-Dimensional 4f Magnets

Gadolinium Halide Monolayers: A Fertile Family of Two-Dimensional 4f Magnets

Possible structural and bond reconstruction in 2D ferromagnetic semiconductor VSe2 under uniaxial stress

First-principles study of the valley-polarized quantum anomalous Hall effect in TiBrTe monolayers

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