▎ 摘　　要

The concept of pseudospins in graphene was previously introduced in order to describe the electron motion near the high-symmetry point of the Brillouin zone. Many physical properties are related to the pseudospins. In this work, we present a mechanism of mediating the pseudospin interaction by circularly polarized photons. This interaction can switch the out-of-plane component of pseudospins and enable graphene to exhibit a ferromagnetic behavior. This mechanism allows us to build an analog quantum simulator of exchange interaction in terms of the optical cavity and graphene. We give the coupling coefficient between the pseudospins located on any two points and calculate the average of the pseudospin component by a generating functional technique. We predict a new type of plasmon-polariton involving the exchange interaction. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim