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- W2094597310 abstract "We present an analytical effective theory for the magnetic phase diagram for zigzag-edge terminated honeycomb nanoribbons described by a Hubbard model with an interaction parameter $U$. We show that the edge magnetic moment varies as $mathrm{ln}U$ and uncover its dependence on the width $W$ of the ribbon. The physics of this owes its origin to the sensory-organ-like response of the nanoribbons, demonstrating that considerations beyond the usual Stoner-Landau theory are necessary to understand the magnetism of these systems. A first-order magnetic transition from an antiparallel orientation of the moments on opposite edges to a parallel orientation occurs upon doping with holes or electrons. The critical doping for this transition is shown to depend inversely on the width of the ribbon. Using variational Monte Carlo calculations, we show that magnetism is robust to fluctuations. Additionally, we show that the magnetic phase diagram is generic to zigzag-edge terminated nanostructures such as nanodots. Furthermore, we perform first-principles modeling to show how such magnetic transitions can be realized in substituted graphene nanoribbons." @default.
- W2094597310 created "2016-06-24" @default.
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- W2094597310 date "2013-02-07" @default.
- W2094597310 modified "2023-09-23" @default.
- W2094597310 title "Sensory-organ-like response determines the magnetism of zigzag-edged honeycomb nanoribbons" @default.
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- W2094597310 doi "https://doi.org/10.1103/physrevb.87.085412" @default.
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