Electric field induced large Rashba effect and topological phase transition in halide perovskite superlattices

Wang, Xinyu; Xu, Li; Tian, Hao; Sang, H.; Zhou, Jian; Chen, Lan; Zhao, Hong Jian; Wu, Di; Zhang, Haijun; Bellaïche, L.; Liu, Junming; Yang, Yurong

doi:10.1103/physrevb.108.045114

Cited by 2 publications

(4 citation statements)

References 63 publications

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“…The Rashba parameter is about 7 eVÅ when the pressure reaches the critical value, as well as remarkedly enhanced by comparison with that of the double perovskite without applying the pressure, and is larger than that of SnTe reported in ref . According to the reported work, , we found that it is general that the Rashba effect can be remarkedly enhanced at the point of the topological phase transition with a gapless state.…”

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confidence: 61%

Pressure-Induced Topological Phase Transition and Large Rashba Effect in Halide Double Perovskite

Wang,

Tian,

et al. 2024

J. Phys. Chem. Lett.

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In general, hydrostatic pressure can suppress ferroelectric polarization and further reduce Rashba spin-splitting, considering the spin−orbit coupling effect. Here, we present the design of ferroelectric double perovskite Cs 2 SnSiI 6 , which exhibits the anomalous enhancement of Rashba spin-splitting parameters by pressure-induced ferroelectric topological order. The Rashba effect is nonlinear with the decrease in polarization under pressure and reaches a maximum at the pressure-induced Weyl semimetal (WSM) state between the transition from a normal insulator (NI) to a topological insulator (TI). Furthermore, we discover that controlling ferroelectric polarization with an electric field can also induce the topological transition with a large Rashba spin-splitting but under a lower critical pressure. These discoveries show a tunable gaint Rashba effect and pressure-induced topological phase transition for Cs 2 SnSiI 6 , which can promote future research on the interaction between the Rashba effect and topological order, and its application to new electronic and spintronic devices.

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confidence: 61%

Pressure-Induced Topological Phase Transition and Large Rashba Effect in Halide Double Perovskite

Wang,

Tian,

et al. 2024

J. Phys. Chem. Lett.

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“…The superconductivity can be realized using the proximity effect by doping or interfacing SnTe with PbTe. , The possibility of ferroelectricity of the cubic phase is addressed in a recent experimental paper, and further studies are necessary on ferroelectricity and its interplay with the topology. In SnTe, the ferroelectricity produces the Rashba effect because the inversion symmetry is broken; in PbTe, we have strong SOC; then in Pb 1– x Sn x Te, due to the combination of lack of inversion symmetry and strong SOC, we can have the ferroelectric Rashba topological system. , …”

Section: Discussionmentioning

confidence: 98%

“…In SnTe, the ferroelectricity produces the Rashba effect because the inversion symmetry is broken; in PbTe, we have strong SOC; then in Pb 1– x Sn x Te, due to the combination of lack of inversion symmetry and strong SOC, we can have the ferroelectric Rashba topological system. 67 , 68 …”

Section: Discussionmentioning

confidence: 99%

“…In SnTe, the ferroelectricity produces the Rashba effect because the inversion symmetry is broken; in PbTe, we have strong SOC; then in Pb 1−x Sn x Te, due to the combination of lack of inversion symmetry and strong SOC, we can have the ferroelectric Rashba topological system. 67,68 Regarding the experimental surface orientation of the facets, the first NWs grown in 2013 were far from being perfect. Nowadays, experimental NWs can be grown free of defects, 43 and it is possible to select the desired (001) facet or other facets.…”

Section: ■ Conclusionmentioning

confidence: 99%

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Density Functional Theory Study of the Spin–Orbit Insulating Phase in SnTe Cubic Nanowires: Implications for Topological Electronics

Hussain,

Warda,

Cuono

et al. 2024

ACS Appl. Nano Mater.

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We investigate the electronic, structural, and topological properties of the SnTe and PbTe cubic nanowires using ab initio calculations. Using standard and linear-scale density functional theory, we go from the ultrathin limit up to the nanowire thicknesses observed experimentally. Finite-size effects in the ultrathin limit produce an electric quadrupole and associated structural distortions; these distortions increase the band gap, but they get reduced with the size of the nanowires and become less and less relevant. Ultrathin SnTe cubic nanowires are trivial band gap insulators; we demonstrate that by increasing the thickness, there is an electronic transition to a spin–orbit insulating phase due to trivial surface states in the regime of thin nanowires. These trivial surface states with a spin–orbit gap of a few meV appear at the same k-point of the topological surface states. Going to the limit of thick nanowires, we should observe the transition to the topological crystalline insulator phase with the presence of two massive surface Dirac fermions hybridized with the persistent trivial surface states. Therefore, we have the copresence of massive Dirac surface states and trivial surface states close to the Fermi level in the same region of the k-space. According to our estimation, the cubic SnTe nanowires are trivial insulators below the critical thickness t c1 = 10 nm, and they become spin–orbit insulators between t c1 = 10 nm and t c2 = 17 nm, while they transit to the topological phase above the critical thickness of t c2 = 17 nm. These critical thickness values are in the range of typical experimental thicknesses, making the thickness a relevant parameter for the synthesis of topological cubic nanowires. Pb1–x Sn x Te nanowires would have both these critical thicknesses t c1 and t c2 at larger values depending on the doping concentration. We discuss the limitations of density functional theory in the context of topological nanowires and the consequences of our results on topological electronics.

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Electric field induced large Rashba effect and topological phase transition in halide perovskite superlattices

Cited by 2 publications

References 63 publications

Pressure-Induced Topological Phase Transition and Large Rashba Effect in Halide Double Perovskite

Pressure-Induced Topological Phase Transition and Large Rashba Effect in Halide Double Perovskite

Density Functional Theory Study of the Spin–Orbit Insulating Phase in SnTe Cubic Nanowires: Implications for Topological Electronics

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