Nano Letters· 2026Q1
Direct Selenization Growth and Electronic Properties of Ultrathin Fe(Te,Se) on a van der Waals Ferromagnet
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- 2026year
Short summary
Researchers achieved epitaxial growth of monolayer-to-trilayer Fe(Te,Se) films on a ferromagnet (Fe3GeTe2) using direct selenization, without needing to deposit external Fe or Te.
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Key points
- Monolayer-to-trilayer Fe(Te,Se) films were epitaxially grown on Fe3GeTe2 via direct selenization.
- The growth process did not require external deposition of Fe or Te.
- Characterizations confirmed large-area, atomically flat films with rotational alignment to the substrate.
- Electronic structures evolved with film thickness, showing progressive decoupling from the ferromagnetic substrate.
- Asymmetric band bending and charge redistribution were observed at lateral monolayer–bilayer interfaces.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Fe(Te,Se) is a prototypical iron-based superconductor and a promising platform for exploring topological superconductivity. However, growing high-quality ultrathin Fe(Te,Se) films on magnetic substrates remains challenging. Here, we demonstrate epitaxial growth of monolayer-to-trilayer Fe(Te,Se) on the van der Waals itinerant ferromagnet Fe3GeTe2 (FGT) via direct selenization of the substrate, without external Fe or Te deposition. Combined scanning tunneling microscopy/spectroscopy (STM/STS), low-energy electron diffraction (LEED), scanning transmission electron microscopy (STEM), and energy-dispersive spectroscopy (EDS) characterizations reveal large-area, atomically flat tetragonal films with well-defined rotational alignment to the hexagonal FGT lattice. Cross-sectional STEM-EDS confirms Se incorporation and interfacial elemental redistribution. Thickness-dependent spectroscopy reveals evolving electronic structures and progressive decoupling from the ferromagnetic substrate. Measurements across lateral monolayer–bilayer interfaces further uncover asymmetric band bending and charge redistribution driven by Fermi-level equilibration. These findings establish substrate-mediated selenization as a versatile route to ultrathin superconducting heterostructures and magnetic quantum platforms.
The authors' abstract, as published at the source. Nano Letters, 2026 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science