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Photon‐mediated interaction of pseudospins in graphene
Author(s) -
Feng Peng,
Xie Jianqiao
Publication year - 2015
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201451631
Subject(s) - physics , brillouin zone , photon , graphene , condensed matter physics , symmetry (geometry) , component (thermodynamics) , quantum , coupling (piping) , quantum mechanics , geometry , materials science , mathematics , metallurgy
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.