Strain-controlled spin-splitting in the persistent spin helix state of two-dimensional SnSe monolayer

Anshory, Muhammad; Absor, Moh. Adhib Ulil

doi:10.1016/j.physe.2020.114372

Cited by 18 publications

(16 citation statements)

References 54 publications

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“…Finally, in the discussed MHP systems, the predicted anisotropic spin polarization of the CB is reminiscent of a persistent spin texture 25,55 , which is posited to enable longer spin lifetimes. For chiral systems, the spin polarization is opposite for opposite organic cation chirality 31 , and the ensuing chiral degrees of freedom coupled with a large spin-splitting predicted for some of the current chiral MHPs represent a promising avenue for spin manipulation in prospective spintronic devices.…”

Section: Discussionmentioning

confidence: 97%

Structural descriptor for enhanced spin-splitting in 2D hybrid perovskites

et al. 2021

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Two-dimensional (2D) hybrid metal halide perovskites have emerged as outstanding optoelectronic materials and are potential hosts of Rashba/Dresselhaus spin-splitting for spin-selective transport and spin-orbitronics. However, a quantitative microscopic understanding of what controls the spin-splitting magnitude is generally lacking. Through crystallographic and first-principles studies on a broad array of chiral and achiral 2D perovskites, we demonstrate that a specific bond angle disparity connected with asymmetric tilting distortions of the metal halide octahedra breaks local inversion symmetry and strongly correlates with computed spin-splitting. This distortion metric can serve as a crystallographic descriptor for rapid discovery of potential candidate materials with strong spin-splitting. Our work establishes that, rather than the global space group, local inorganic layer distortions induced via appropriate organic cations provide a key design objective to achieve strong spin-splitting in perovskites. New chiral perovskites reported here couple a sizeable spin-splitting with chiral degrees of freedom and offer a unique paradigm of potential interest for spintronics.

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Section: Discussionmentioning

confidence: 97%

Structural descriptor for enhanced spin-splitting in 2D hybrid perovskites

et al. 2021

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“…Importantly, one can select promising materials for spin-splitting solely based on this single structural parameter and the quantitative relationship established in this work. The predicted anisotropic spin polarization of CB is reminiscent of a persistent spin texture, 24,48 which is posited to enable longer spin lifetimes. For chiral systems, the spin polarization is opposite for opposite organic cation chirality, 30 and the ensuing chiral degrees of freedom coupled with a large spin-splitting predicted for some of the current chiral MHPs represent a promising avenue for spin manipulation in prospective spintronic devices.…”

Section: Discussionmentioning

confidence: 99%

Structural descriptor for enhanced spin-splitting in 2D hybrid perovskites

Jana

Song

Rong

et al. 2021

Preprint

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Two-dimensional (2D) hybrid metal halide perovskites have emerged as outstanding optoelectronic materials and are potential hosts of Rashba/Dresselhaus spin-splitting for spin-selective transport and spin-orbitronics. However, a quantitative microscopic understanding of what controls the spin-splitting magnitude is generally lacking. Through crystallographic and first-principles studies on a broad array of chiral and achiral 2D perovskites, we demonstrate that a specific bond angle disparity connected with asymmetric tilting distortions of metal halide octahedra breaks local inversion symmetry and strongly correlates with computed spin-splitting. This distortion metric can serve as a crystallographic descriptor for rapid discovery of potential candidate materials with strong spin-splitting. Our work establishes that rather than global space group, local inorganic layer distortions induced via appropriate organic cations provide a key design principle to achieve strong spin-splitting in perovskites. New chiral perovskites reported here couple a sizeable spin-splitting with chiral degrees of freedom and offer a unique paradigm of potential interest for spintronics.

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“…However new band splittings happens when the symmetry of a crystal reduces with the strain 47 . Effect of the strain is extensively studied for LR and LD effects 17,46,[48][49][50][51][52] , but effect of strain on PST with PCS is still unknown. Here, we have introduced the out-of-plane strain such that the point group symmetry of crystal remains intact.…”

Section: Effects Of Strainmentioning

confidence: 99%

Full-plane persistent spin textures with cubic order intrinsic and anisotropic band splitting in bulk Lead-free materials

Sajjan¹,

Bhumla²,

Bhattacharya³

2022

Preprint

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Spin-orbit coupling (SOC) effects occurring in noncentrosymmetric materials are known to be responsible for nontrivial spin configurations and a number of emergent physical phenomena such as electrical control of spin degrees of freedom and spin-to-charge conversion. The materials preserving a uniform spin configuration in the momentum-space, known as persistent spin texture (PST), provide long carrier spin lifetimes through persistent spin helix (PSH) mechanism. However, most of the PST studied till now are attributed to the linear in k splitting and cease to exist locally around certain high-symmetry-point of first Brillouin Zone (FBZ). The persistent spin textures with purely cubic spin splittings have drawn attention owing to unique benefits in spin transport. Here, by using the relativistic first-principles calculations supplemented with k.p analysis, we report the emergence of purely cubic splitting (PCS) belonging to D 3h point group, which is enforced by in-plane mirror and three-fold rotation operations. In addition, the in-plane mirror symmetry operation sustains the PST in larger region (i.e. full planes) of FBZ alongside giant spin splitting. Our results also demonstrate how application of uniaxial strain could be envisaged to tune the magnitude of the PCS, preserving the PST. The observed PSTs provide a route to non-dephasing spin transport with larger spin-Hall conductivity, thus offering a promising platform for future spintronics devices.

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Strain-controlled spin-splitting in the persistent spin helix state of two-dimensional SnSe monolayer

Cited by 18 publications

References 54 publications

Structural descriptor for enhanced spin-splitting in 2D hybrid perovskites

Structural descriptor for enhanced spin-splitting in 2D hybrid perovskites

Structural descriptor for enhanced spin-splitting in 2D hybrid perovskites

Full-plane persistent spin textures with cubic order intrinsic and anisotropic band splitting in bulk Lead-free materials

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