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The frequency shift and broadening of long-wavelength optical phonons due to interactions with electrons are calculated in a monolayer graphene in magnetic fields. The broadening is resonantly enhanced and the frequency shift exhibits a rapid change when the phonon energy becomes the energy separation of Landau levels between which optical transitions are allowed.doi:10.1143/jpsj.76.024712 fatcat:2muk5ovqjzgvnh5m5cqgy7wsfa