Charge Transfer and Asymmetric Coupling of MoSe<sub>2</sub> Valleys to the Magnetic Order of CrSBr

Serati de Brito, Caique; Faria Junior, Paulo E.; Ghiasi, Talieh S.; Ingla-Aynés, Josep; Rabahi, César Ricardo; Cavalini, Camila; Dirnberger, Florian; Mañas-Valero, Samuel; Watanabe, Kenji; Taniguchi, Takashi; Zollner, Klaus; Fabian, Jaroslav; Schüller, Christian; van der Zant, Herre S. J.; Gobato, Yara Galvão

doi:10.1021/acs.nanolett.3c03431

Cited by 4 publications

(2 citation statements)

References 80 publications

(147 reference statements)

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“…More conventional proximity effects are observed in heterostructures of graphene, where the ferromagnetic order of the interfacial CrSBr layer induces spin-polarization for conduction through the graphene layer . CrSBr also acts as an interfacial electron acceptor in heterostructures with MoSe 2 , wherein the degree of charge transfer is sensitive to the magnetic state of CrSBr . While less explored than heterostructures with the chromium trihalide family, these early results highlight the ability to leverage the air stability and in-plane magnetization of CrSBr in new vdW assemblies.…”

Section: Coupling Between Electronic and Magnetic Structurementioning

confidence: 98%

“…The in-plane magnetization of CrSBr generates a perpendicular stray field only at its edge, allowing for precise positioning of a local vertical field in vdW heterostructures . Recent computational and experimental results provide evidence for interfacial charge transfer between CrSBr and graphene or semiconducting TMDs. , Coupling between the band structure of these materials and the quasi-1D conduction band of CrSBr could provide a general route to achieve 1D physics via proximity effects.…”

Section: Outlook and Future Directionsmentioning

confidence: 99%

See 1 more Smart Citation

CrSBr: An Air-Stable, Two-Dimensional Magnetic Semiconductor

Ziebel,

Feuer,

Cox

et al. 2024

Nano Lett.

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The discovery of magnetic order at the 2D limit has sparked new exploration of van der Waals magnets for potential use in spintronics, magnonics, and quantum information applications. However, many of these materials feature low magnetic ordering temperatures and poor air stability, limiting their fabrication into practical devices. In this Mini-Review, we present a promising material for fundamental studies and functional use: CrSBr, an air-stable, two-dimensional magnetic semiconductor. Our discussion highlights experimental research on bulk CrSBr, including quasi-1D semiconducting properties, A-type antiferromagnetic order (T N = 132 K), and strong coupling between its electronic and magnetic properties. We then discuss the behavior of monolayer and few-layer flakes and present a perspective on promising avenues for further studies on CrSBr.

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Section: Coupling Between Electronic and Magnetic Structurementioning

confidence: 98%

Section: Outlook and Future Directionsmentioning

confidence: 99%

CrSBr: An Air-Stable, Two-Dimensional Magnetic Semiconductor

Ziebel,

Feuer,

Cox

et al. 2024

Nano Lett.

View full text Add to dashboard Cite

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Room-temperature field-free valley exciton splitting in monolayer semiconductors achieved by perpendicular magnetic proximity effect

Lv,

Liang,

et al. 2024

Applied Physics Letters

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The magnetic proximity effect at ferromagnet/semiconductor interface has been demonstrated as an effective method to generate and control valley splitting states in the semiconductor, which has potential for valley-based information processing devices. However, currently, this method typically requires cryogenic temperature or continuous application of external fields, due to limitation of the ferromagnet used. Here, we report room-temperature valley exciton splitting in semiconducting monolayer WS2 without the need of an external magnetic field. This is achieved by interfacing the monolayer WS2 with a room-temperature ferromagnet L10-phase FePt possessing strong perpendicular magnetic anisotropy, which provides a field-free perpendicular magnetic proximity effect and permanently lifts the valley degeneracy of WS2 via Zeeman interaction. Circularly polarized photoluminescence measurements reveal that the intensity and energy of exciton emissions show strong dependence on the excitation and detection helicity and the magnetization direction of FePt, and the valley exciton splitting can reach very large values of 4.9, 11.7, and 19.2 meV for neutral exciton, trion, and defect-bound exciton, respectively.

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Ultrathin natural biotite crystals as a dielectric layer for van der Waals heterostructure applications

de Oliveira,

Barbosa Yoshida,

Rabahi

et al. 2024

Nanotechnology

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Biotite, an iron-rich mineral belonging to the trioctahedral mica group, is a naturally abundant layered material (LM) exhibiting attractive electronic properties for application in nanodevices. Biotite stands out as a non-degradable LM under ambient conditions, featuring high-quality basal cleavage—a significant advantage for van der Waals heterostructure (vdWH) applications. In this work, we present the micro-mechanical exfoliation of biotite down to monolayers (1Ls), yielding ultrathin flakes with large areas and atomically flat surfaces. To identify and characterize the mineral, we conducted a multi-elemental analysis of biotite using energy-dispersive spectroscopy mapping. Additionally, synchrotron x-ray fluorescence and infrared nano-spectroscopy were employed to probe its iron content and vibrational signature in few-layer form, respectively, with sensitivity to the layer number. We have also observed good morphological and structural stability in time (up to 12 months) and no important changes in their physical properties after thermal annealing processes in ultrathin biotite flakes. Conductive atomic force microscopy evaluated its electrical capacity, revealing an electrical breakdown strength of approximately 1 V nm−1. Finally, we explore the use of biotite as a substrate and encapsulating LM in vdWH applications. We have performed optical and magneto-optical measurements at low temperatures. We find that ultrathin biotite flakes work as a good substrate for 1L-MoSe2, comparable to hexagonal boron nitride flakes, but it induces a small change of the 1L-MoSe2 g-factor values, most likely due to natural impurities on its crystal structure. Furthermore, our results show that biotite flakes are useful systems to protect sensitive LMs such as black phosphorus from degradation for up to 60 days in ambient air. Our study introduces biotite as a promising, cost-effective LM for the advancement of future ultrathin nanotechnologies.

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Charge Transfer and Asymmetric Coupling of MoSe₂ Valleys to the Magnetic Order of CrSBr

Cited by 4 publications

References 80 publications

CrSBr: An Air-Stable, Two-Dimensional Magnetic Semiconductor

CrSBr: An Air-Stable, Two-Dimensional Magnetic Semiconductor

Room-temperature field-free valley exciton splitting in monolayer semiconductors achieved by perpendicular magnetic proximity effect

Ultrathin natural biotite crystals as a dielectric layer for van der Waals heterostructure applications

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Charge Transfer and Asymmetric Coupling of MoSe2 Valleys to the Magnetic Order of CrSBr

Cited by 4 publications

References 80 publications

CrSBr: An Air-Stable, Two-Dimensional Magnetic Semiconductor

CrSBr: An Air-Stable, Two-Dimensional Magnetic Semiconductor

Room-temperature field-free valley exciton splitting in monolayer semiconductors achieved by perpendicular magnetic proximity effect

Ultrathin natural biotite crystals as a dielectric layer for van der Waals heterostructure applications

Contact Info

Product

Resources

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Charge Transfer and Asymmetric Coupling of MoSe₂ Valleys to the Magnetic Order of CrSBr