Ultrastrong light-matter coupling of cyclotron transition in monolayerMoS2

Abstract

The light-matter interaction in monolayer MoS2 system under a perpendicular magnetic field is theoretically investigated with the consideration of the influence of electron-hole asymmetry. For high filling factor of Landau Levels, we show that the system can enter the ultrastrong coupling regime. However, in contrast to graphene, MoS2 system shows no vacuum instability in our considered doping range. As for magnetopolariton dispersion of MoS2 in our considered magnetic field range, the magnetopolariton is valley degenerate. Moreover, although the lower branch of magnetopolariton has the spin degenerate, the upper branch shows no spin degenerate at high magnetic field. Our study can lead to tunable polariton-based devices and cavity-controlled magnetotransport in MoS2 system.