High-Temperature Quantum Anomalous Hall Insulators in Lithium-Decorated Iron-Based Superconductor Materials
Yang Li, Jiaheng Li, Yang Li, Meng Ye, Fawei Zheng, Zetao Zhang, Jingheng Fu, Wenhui Duan, Yong Xu
DOI 10.1103/PhysRevLett.125.086401 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Quantum anomalous Hall (QAH) insulator is the key material to study emergent topological quantum effects, but its ultralow working temperature limits experiments. Here, by first-principles calculations, we find a family of stable two-dimensional (2D) structures generated by lithium decoration of layered iron-based superconductor materials Fe X(X=S,Se,Te), and predict room-temperature ferromagnetic semiconductors together with large-gap high-Chern-number QAH insulators in the 2D materials. The extremely robust ferromagnetic order is induced by the electron injection from Li to Fe and stabilized by strong ferromagnetic kinetic exchange in the 2D Fe layer. While in the absence of spin-orbit coupling (SOC), the ferromagnetism polarizes the system into a half Dirac semimetal state protected by mirror symmetry, the SOC effect results in a spontaneous breaking of mirror symmetry and introduces a Dirac mass term, which creates QAH states with sizable gaps (several tens of meV) and multiple chiral edge modes. We also find a 3D QAH insulator phase featured by a macroscopic number of chiral conduction channels in bulk LiOH−LiFe X. The findings open new opportunities to realize novel QAH physics and applications at high temperatures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Competing instabilities, orbital ordering, and splitting of band degeneracies from a parquet renormalization group analysis of a four-pocket model for iron-based superconductors: Application to FeSe
similarity 0.94Rui-Qi Xing et al.
Source status unknown — claims are unverified
Interplay between Magnetism, Superconductivity, and Orbital Order in 5-Pocket Model for Iron-Based Superconductors: Parquet Renormalization Group Study
similarity 0.94Laura Classen et al.
Source status unknown — claims are unverified
Enhanced superconducting fluctuation effects on thermodynamic properties in the BCS-BEC crossover regime
similarity 0.94Kyosuke Adachi & Ryusuke Ikeda
Source status unknown — claims are unverified
Orbital-dependent self-energy effects and consequences for the superconducting gap structure in multiorbital correlated electron systems
similarity 0.94Kristofer Björnson et al.
Source status unknown — claims are unverified
Lifting of Gap Nodes by Disorder in Tetragonal FeSe1−xSx Superconductors
similarity 0.93T. Nagashima et al.
Source status unknown — claims are unverified
Impurity effect on Bogoliubov Fermi surfaces: Analysis based on iron-based superconductors
similarity 0.93Tatsuya Miki et al.
Source status unknown — claims are unverified