Unveiling the stacking-dependent electronic properties of 2D ultrathin rare-earth metalloxenes family LnX_2 (Ln = Eu, Gd, Dy; X = Ge, Si)
arxiv(2024)
摘要
The studies of electronic effects in reduced dimensionality have become a
frontier in nanoscience due to exotic and highly tunable character of quantum
phenomena. Recently, a new class of 2D ultrathin LnX_2 metalloxenes composed
of a triangular lattice of lanthanide ions (Ln) coupled with 2D-Xenes of
silicene or germanene (X_2) was introduced and studied with a particular
focus on magnetic and transport properties. However, the electronic properties
of metalloxenes and their effective functionalization remain mainly unexplored.
Here, using a number of experimental and theoretical techniques, we trace the
evolution of electronic properties and magnetic ground state of metalloxenes
triggered by external perturbations. We demonstrate that the band structure of
LnX_2 films can be uniquely modified by controlling the Xenes stacking,
thickness, varying the rare-earth and host elements, and applying an external
electric field. Our findings suggest new pathways to manipulate the electronic
properties of 2D rare-earth magnets that can be adjusted for spintronics
applications.
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