Abstract

Floquet engineering severs as a forceful technique for uncovering high Chern numbers of quantum anomalous Hall (QAH) states with feasible tunability in high-order topologically insulating plumbene, which is readily accessible for experimental investigations. Under the irradiation of right-handed circularly polarized light, we predict a three-stage topological phase transition in plumbene, whether it is in a free-standing form or grown on h-BN. Initially, a metallic state evolves into a K(K′)-valley-based QAH state with a Chern number of –8, which then decreases to –6 after the valley gap closes. Finally, a band inversion occurs at the Γ point, resulting in a multichannel QAH state with C = –3. The trigonal warping model accounts for both K(K′)-valley-based and Γ-point-based QAH states. Additionally, growing plumbene on a non-van-der-Waals substrate eliminates the K(K′)-valley-based topology, leaving only the Γ-point-based QAH state with C = +3.

Abstract

Floquet engineering severs as a forceful technique for uncovering high Chern numbers of quantum anomalous Hall (QAH) states with feasible tunability in high-order topologically insulating plumbene, which is readily accessible for experimental investigations. Under the irradiation of right-handed circularly polarized light, we predict a three-stage topological phase transition in plumbene, whether it is in a free-standing form or grown on h-BN. Initially, a metallic state evolves into a K(K′)-valley-based QAH state with a Chern number of –8, which then decreases to –6 after the valley gap closes. Finally, a band inversion occurs at the Γ point, resulting in a multichannel QAH state with C = –3. The trigonal warping model accounts for both K(K′)-valley-based and Γ-point-based QAH states. Additionally, growing plumbene on a non-van-der-Waals substrate eliminates the K(K′)-valley-based topology, leaving only the Γ-point-based QAH state with C = +3.

Abstract

Floquet engineering severs as a forceful technique for uncovering high Chern numbers of quantum anomalous Hall (QAH) states with feasible tunability in high-order topologically insulating plumbene, which is readily accessible for experimental investigations. Under the irradiation of right-handed circularly polarized light, we predict a three-stage topological phase transition in plumbene, whether it is in a free-standing form or grown on h-BN. Initially, a metallic state evolves into a K(K′)-valley-based QAH state with a Chern number of –8, which then decreases to –6 after the valley gap closes. Finally, a band inversion occurs at the Γ point, resulting in a multichannel QAH state with C = –3. The trigonal warping model accounts for both K(K′)-valley-based and Γ-point-based QAH states. Additionally, growing plumbene on a non-van-der-Waals substrate eliminates the K(K′)-valley-based topology, leaving only the Γ-point-based QAH state with C = +3.

Abstract

Floquet engineering severs as a forceful technique for uncovering high Chern numbers of quantum anomalous Hall (QAH) states with feasible tunability in high-order topologically insulating plumbene, which is readily accessible for experimental investigations. Under the irradiation of right-handed circularly polarized light, we predict a three-stage topological phase transition in plumbene, whether it is in a free-standing form or grown on h-BN. Initially, a metallic state evolves into a K(K′)-valley-based QAH state with a Chern number of –8, which then decreases to –6 after the valley gap closes. Finally, a band inversion occurs at the Γ point, resulting in a multichannel QAH state with C = –3. The trigonal warping model accounts for both K(K′)-valley-based and Γ-point-based QAH states. Additionally, growing plumbene on a non-van-der-Waals substrate eliminates the K(K′)-valley-based topology, leaving only the Γ-point-based QAH state with C = +3.