Tunable dynamical magnetoelectric effect in antiferromagnetic topological insulator MnBi$_2$Te$_4$ films

Nonlinear level attraction of cavity axion polariton in antiferromagnetic topological insulator

“…The ultra-strong coupling with a low dissipation rate have been achieved, implying the potential application in cavity quantum electrodynamics. On the other hand, thanks to the fast-growing field of MnBi 2 Te 4 -based magnetic topological materials and state-of-art experimental techniques [19][20][21][22][23][24][25], it seems quite promising that candidate materials hosting large topological DAF, such as MnBi 2 Te 4 films, Mn 2 Bi 2 Te 5 and MnBi 2 Te 4 /Bi 2 Te 3 superlattice proposed by some of the authors [18,20], can be realized in the short future and pave the way for the development of cavity axion ploarition and potential applications in quantum information and discovery of dark matter in the universe.…”

“…Recently, several topological dynamical axion insulators (DAIs) were proposed to host large DAF protected by nonzero spin Chern number [17] and strongly couple with the light, for example, van der Waals(vdW) layered material Mn 2 Bi 2 Te 5 [7] and MnBi 2 Te 4 /Bi 2 Te 3 superlattice [17]. Especially, some of us predicted tunable DAF in MnBi 2 Te 4 films [18] which has been successfully synthesized in experiments [19][20][21][22][23][24][25]. Detailed discussions on axion materials can also be found in a recent review [26].…”