Thomas Brumme

Spectrally Programmable Spin‐Polarized Photocurrents in WSe 2 –NiPS 3 Magnetic van der Waals Heterostructures

Rajesh Kumar Yadav, Michal Poplinger, Adi Levi, Adi Harchol et autres

ABSTRACT Efficient generation and control of spin‐polarized currents in semiconductors remain central challenges for spin‐based electronics, particularly due to impedance mismatch and the reliance on magnetic fields or ferromagnetic contacts. Here, we introduce a materials platform for spectrally programmable spin transport based …

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Crystal Anisotropy Implications on the Magneto‐Optical Properties of van der Waals FePS 3

Ellenor Geraffy, K.N. Sharma, Shahar Zuri, Faris Horani et autres

ABSTRACT Antiferromagnetic FePS 3 has recently gained significant interest in its potential applications in spin‐related devices. Here, we show that in‐plane structural anisotropy has a major impact in shaping the optical responses of FePS 3 single‐crystals from the bulk form down to …

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Spectrally Programmable Spin-Polarized Photocurrents in WSe$_2$-NiPS$_3$ Magnetic van der Waals Heterostructures

Rajesh Kumar Yadav, Michal Poplinger, Adi Levi, Adi Harchol et autres

Efficient generation and control of spin-polarized currents in semiconductors remain central challenges for spin-based electronics, particularly due to impedance mismatch and the reliance on magnetic fields or ferromagnetic contacts. Here, we introduce a materials platform for spectrally programmable spin transport based on …

Emergence of Nonuniform Strain-Induced Exciton Species in Bilayer Transition Metal Dichalcogenides

Mohammadreza Daqiqshirazi, Thomas Brumme

High Resolution Image Download MS PowerPoint Slide Full control over excitons in 2D materials is an important step toward their exploitation for applications. Strain modulation is one method that can be used to effectively control the movement of the excitons. Unfortunately, the …

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Emergence of Nonuniform Strain-Induced Exciton Species in Bilayer Transition Metal Dichalcogenides

Mohammadreza Daqiqshirazi, Thomas Brumme

High Resolution Image Download MS PowerPoint Slide Full control over excitons in 2D materials is an important step toward their exploitation for applications. Strain modulation is one method that can be used to effectively control the movement of the excitons. Unfortunately, the …

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Quantum Confinement Effect in a Heteromorphic PbS/SnS 2 Superlattice Grown by Atomic Layer Deposition

Dong-Ho Shin, Mohammadreza Daqiqshirazi, Amin Bahrami, Sebastian Lehmann et autres

High Resolution Image Download MS PowerPoint Slide Quantum confinement in artificial superlattices enables the engineering of electronic and optical properties that exceed bulk limitations. Despite the unrivaled precision in thickness control and scalability of atomic layer deposition (ALD), the experimental demonstration of …

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Defects That Magnetize Beyond Monolayer PtSe 2

Ilias M. Oikonomou, Danielle Douglas‐Henry, Mohammadreza Daqiqshirazi, Iva Plutnarová et autres

ABSTRACT Defect‐induced magnetism in two‐dimensional (2D) materials holds enormous potential for next‐generation spintronic and quantum devices, yet its realization beyond monolayer remains elusive. In this work, we investigate the emergence and modulation of magnetism in multilayer PtSe 2 via a combined theoretical–experimental …

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Localized Exciton Emission with Spontaneous Circular Polarization in NiPS3/WSe2 Heterostructures

Adi Harchol, Shahar Zuri, Rajesh Kumar Yadav, Nirman Chakraborty et autres

Two-dimensional (2D) van der Waals (vdW) heterostructures (HSs) provide a versatile platform for tailoring electronic, optical, and magnetic properties via proximity effects at their interfaces. In this work, we explore the optical response of few-layer NiPS3/WSe2 HSs using low-temperature micro-photoluminescence (μ-PL) and …

Designer metal-free altermagnetism in honeycomb two-dimensional frameworks

Hongde Yu, Thomas Brumme, Thomas Heine

Altermagnetism combines momentum-dependent spin splitting of opposite-spin channels with zero net magnetization, enabling electric-field control of spin transport that is robust against external magnetic fields. Although widely explored in inorganic systems, metal-free altermagnets with pi-spin splitting, particularly in two-dimensional organic frameworks, have …

Crystal Anisotropy Implications on the Magneto-Optical Properties of van der Waals FePS3

Ellenor Geraffy, K.N. Sharma, Shahar Zuri, Faris Horani et autres

Antiferromagnetic FePS3 has recently gained significant interest in its potential applications in spin-related devices. Here, we show that in-plane structural anisotropy has a major impact in shaping the optical responses of FePS3 single-crystals from the bulk form down to the monolayer limit. …

Spin Injection and Emission Helicity Switching in a 2D Perovskite/WSe 2 Heterostructure

J. Jasiński, Francesco Gucci, Thomas Brumme, Swaroop Palai et autres

The ability to initialize and control long-lived spin populations in lead halide perovskites is essential to enable their use in spintronics technologies. Here, we show that the interlayer exciton observed in the photoluminescence spectrum of a (BA) 2 PbI 4 /WSe 2 …

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Edge‐State Competition in a 2D Topological Insulator‐Semiconductor Heterostructure

Wei Li, Pier Philipsen, Thomas Brumme, Thomas Heine

ABSTRACT Quantum spin Hall edge transport in 2D transition‐metal dichalcogenides depends on whether their 1D edge channels are preserved under realistic substrates and device boundaries. Here we implement spin‐orbit coupling in DFTB and GFN‐xTB within the Amsterdam Modeling Suite, and apply it …

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