T.B. Prayitno
We employed first-principles calculations based on the generalized Bloch theorem to compute the magnon energies in bilayer zigzag graphene nanoribbons for the AB-stacked structure, spanning the entire first Brillouin zone. In the absence of doping, we observed a ferromagnetic ground state for all ribbon widths. When electron-hole doping was applied, we observed the spiral ground state, yielding a magnetic transition. However, the position of the wavevector, in which the spiral state exists, was very short; thus, it was very difficult to observe in the experiment. We suggested that a strong mechanism was needed to induce the spiral state in the long wavevector. © Published under licence by IOP Publishing Ltd.
Department Of Physics, Universitas Negeri Jakarta, Jakarta, Indonesia
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