Electrically Induced Topological Chirality Switching in Orbital-Engineered Covalent Organic Radical Framework Monolayers DOI

Yifan Li,

Kai Zhang, Yu Pan

et al.

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: unknown, P. 5188 - 5194

Published: May 15, 2025

Engineering the topological properties of a quantum anomalous Hall (QAH) insulator is crucial for advancing spintronics and devices. Conventional methods relying on external magnetic fields face limitations in their scalability energy efficiency. Here, we present realization bipolar semiconductor (BTMS) using two-dimensional covalent organic radical frameworks (2D CORFs) based an orbital-engineering approach. These BTMS host spin-polarized Dirac cones flat bands with opposite Chern numbers, enabling electrically driven chiral switching QAH phase. The triacene(TRI)-CORFs achieve reversible transitions between nontrivial flat-band insulators phase via carrier doping or heteroatom substitution (e.g., N/B doping), while maintaining robust room-temperature ferromagnetism (TC ≈ 508 K), where chirality inversion edge currents confirmed by Berry curvature analysis. This work establishes 2D CORFs as versatile platform tunable devices, bridging gap chemistry spintronics.

Language: Английский

Synthesis and Characterization of Fe‐Phthalocyanine‐Based Metal–Organic Framework DOI Creative Commons

Hiroshi Oi,

M. Isobe,

Riko Kishikawa

et al.

Advanced Physics Research, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 15, 2025

Abstract This paper reports the successful synthesis of Fe‐phthalocyanine‐based metal‐organic framework (FePc‐MOF) by simple thermal polymerization. FePc‐MOF is a promising candidate for Lieb lattice, which type Dirac materials with two independent sites in square unit cell, and it theoretically predicted to have unique electronic structure featuring both band flat near Fermi level. The prepared samples exhibit FePc‐MOF, as confirmed X‐ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy. pellet demonstrates electrical conductivity approximately thousand times higher than that its precursor, octacyano‐Fe‐phthalocyanine. significant increase compared precursor indicates has 2D π‐electron system FePc‐based consistent prediction semiconductor narrow energy gap due lattice‐like structure. method developed this study expected advance fundamental research on lattices new magnetic functional materials.

Language: Английский

Citations

0
Electrically Induced Topological Chirality Switching in Orbital-Engineered Covalent Organic Radical Framework Monolayers DOI

Yifan Li,

Kai Zhang, Yu Pan

et al.

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: unknown, P. 5188 - 5194

Published: May 15, 2025

Engineering the topological properties of a quantum anomalous Hall (QAH) insulator is crucial for advancing spintronics and devices. Conventional methods relying on external magnetic fields face limitations in their scalability energy efficiency. Here, we present realization bipolar semiconductor (BTMS) using two-dimensional covalent organic radical frameworks (2D CORFs) based an orbital-engineering approach. These BTMS host spin-polarized Dirac cones flat bands with opposite Chern numbers, enabling electrically driven chiral switching QAH phase. The triacene(TRI)-CORFs achieve reversible transitions between nontrivial flat-band insulators phase via carrier doping or heteroatom substitution (e.g., N/B doping), while maintaining robust room-temperature ferromagnetism (TC ≈ 508 K), where chirality inversion edge currents confirmed by Berry curvature analysis. This work establishes 2D CORFs as versatile platform tunable devices, bridging gap chemistry spintronics.

Language: Английский

Citations

0