Interaction-driven Chern insulating phases in the α - T 3 lattice with Rashba spin-orbit coupling.

Autor:	Lin SQ; School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China., Tan H; School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China., Fu PH; School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China.; Science, Mathematics and Technology, Singapore University of Technology and Design, 8 Somapah Road, Singapore City 487372, Singapore., Liu JF; School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China.
Jazyk:	angličtina
Zdroj:	IScience [iScience] 2023 Aug 07; Vol. 26 (9), pp. 107546. Date of Electronic Publication: 2023 Aug 07 (Print Publication: 2023).
DOI:	10.1016/j.isci.2023.107546
Abstrakt:	The magnetic interaction is a necessary ingredient to break the time-reversal symmetry in realizing quantum anomalous Hall, or Chern insulating phases. Here, we study topological phases in the α - T 3 model, a minimal theoretical model supporting the flat band, taking account of Rashba spin-orbit coupling and flat-band-induced spontaneous ferromagnetism. By analyzing the interaction-driven phase diagrams, band structures, topological edge states, and topological invariants, we demonstrate that this system offers a platform for realizing a wide range of phases, including normal insulators, semimetals, and Chern insulators. Uniquely, there exist both high-Chern-number insulators and valley-polarized Chern insulators. In the latter phase, edge channels exist in the single valley, leading to nearly 100 % valley polarization. These findings demonstrate the potential of interaction-driven systems in realizing exotic phases and their promising role in future applications in topology electronics and valleytronics. Competing Interests: The authors declare no competing interests. (© 2023 The Author(s).)
Databáze:	MEDLINE
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