Tunable spin-polarized band gap in Si<sub>2</sub>/NiI<sub>2</sub> vdW heterostructure

Vargas, Douglas Duarte de; Baierle, R. J.

doi:10.1039/c9ra10199c

Cited by 7 publications

(2 citation statements)

References 55 publications

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“…The usual excitonic PL should be weak since the energy bandgap is indirect. [ 15 ] However, our exciton is local, so the bandgap's nature may be irrelevant here.…”

Section: Resultsmentioning

confidence: 99%

Multiferroic‐Enabled Magnetic‐Excitons in 2D Quantum‐Entangled Van der Waals Antiferromagnet NiI₂

et al. 2022

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does not readily reveal its underlying quantum nature. However, it originates from spin, whose correct picture requires a fully quantum-mechanical and relativistic picture, that is, the Dirac equation. This less clear quantum nature of magnetism is quite handy for a qualitative understanding of magnetism, as demonstrated in Néel's original description of the antiferromagnetic order (AF). [1] However, it is fair to note that a fully quantum-entangled description was also proposed for an antiferromagnetic state as early as in the 1930s by none other than L. Landau. [2] Nevertheless, one does not need to bother with the full quantum description of Landau to understand most magnetic phase transitions. NiPS 3 is an antiferromagnetic van der Waals material with the Néel temperature at 150 K and exhibits a zigzag magnetic order. [3] Although all its bulk properties do not give any hint of surprising quantum nature, a recent study [4] demonstrated that the ground state of Ni 2+ is a quantum-entangled Zhang-Rice triplet (ZRT) state. This ZRT state arises from Matter-light interaction is at the center of diverse research fields from quantum optics to condensed matter physics, opening new fields like laser physics. A magnetic exciton is one such rare example found in magnetic insulators. However, it is relatively rare to observe that external variables control matter-light interaction. Here, it is reported that the broken inversion symmetry of multiferroicity can act as an external knob enabling magnetic excitons in the van der Waals antiferromagnet NiI 2 . It is further discovered that this magnetic exciton arises from a transition between Zhang-Rice-triplet and Zhang-Rice-singlet fundamentally quantum-entangled states. This quantum entanglement produces an ultrasharp optical exciton peak at 1.384 eV with a 5 meV linewidth. The work demonstrates that NiI 2 is 2D magnetically ordered with an intrinsically quantum-entangled ground state.

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“…The usual excitonic PL should be weak since the energy bandgap is indirect. [ 15 ] However, our exciton is local, so the bandgap's nature may be irrelevant here.…”

Section: Resultsmentioning

confidence: 99%

Multiferroic‐Enabled Magnetic‐Excitons in 2D Quantum‐Entangled Van der Waals Antiferromagnet NiI₂

et al. 2022

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“…20 NiI 2 -ML possesses a higher Curie temperature than the CrI 3 monolayer and Cr 2 Ge 2 Te 6 bilayer, thus promising possible realistic applications in spintronic nanodevices. [21][22][23] NiI 2 -ML demonstrates a large photoconductivity in the green light region, promoting the generation of a usable photocurrent in phototransistors. 24 In addition, its magneto-electronic property is flexibly tunable.…”

Section: Introductionmentioning

confidence: 99%

Inducing abundant magnetic phases and enhancing magnetic stability by edge modifications and physical regulations for NiI₂ nanoribbons

Yi,

Han,

et al. 2024

Phys. Chem. Chem. Phys.

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In-situ growth and DFT analysis of nickel halide nanostructures for enhanced electrochemical supercapacitors

Xia,

Xu,

Liu

et al. 2025

Journal of Alloys and Compounds

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Tunable spin-polarized band gap in Si₂/NiI₂ vdW heterostructure

Abstract: Using density functional theory (DFT) calculations we investigate the structural and electronic properties of a heterogeneous van der Waals (vdW) structure consisting of silicene and NiI2 single layers.

Cited by 7 publications

References 55 publications

Multiferroic‐Enabled Magnetic‐Excitons in 2D Quantum‐Entangled Van der Waals Antiferromagnet NiI₂

Multiferroic‐Enabled Magnetic‐Excitons in 2D Quantum‐Entangled Van der Waals Antiferromagnet NiI₂

Inducing abundant magnetic phases and enhancing magnetic stability by edge modifications and physical regulations for NiI₂ nanoribbons

In-situ growth and DFT analysis of nickel halide nanostructures for enhanced electrochemical supercapacitors

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Tunable spin-polarized band gap in Si2/NiI2 vdW heterostructure

Abstract: Using density functional theory (DFT) calculations we investigate the structural and electronic properties of a heterogeneous van der Waals (vdW) structure consisting of silicene and NiI2 single layers.

Cited by 7 publications

References 55 publications

Multiferroic‐Enabled Magnetic‐Excitons in 2D Quantum‐Entangled Van der Waals Antiferromagnet NiI2

Multiferroic‐Enabled Magnetic‐Excitons in 2D Quantum‐Entangled Van der Waals Antiferromagnet NiI2

Inducing abundant magnetic phases and enhancing magnetic stability by edge modifications and physical regulations for NiI2 nanoribbons

In-situ growth and DFT analysis of nickel halide nanostructures for enhanced electrochemical supercapacitors

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Tunable spin-polarized band gap in Si₂/NiI₂ vdW heterostructure

Multiferroic‐Enabled Magnetic‐Excitons in 2D Quantum‐Entangled Van der Waals Antiferromagnet NiI₂

Multiferroic‐Enabled Magnetic‐Excitons in 2D Quantum‐Entangled Van der Waals Antiferromagnet NiI₂

Inducing abundant magnetic phases and enhancing magnetic stability by edge modifications and physical regulations for NiI₂ nanoribbons