@article{ISI:000314762200009,
 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 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. DOI: 10.1103/PhysRevB.87.085412},
 article-number = {085412},
 author = {Bhowmick, Somnath and Medhi, Amal and Shenoy, Vijay B.},
 doi = {10.1103/PhysRevB.87.085412},
 eissn = {2469-9969},
 issn = {2469-9950},
 journal = {PHYSICAL REVIEW B},
 month = {FEB 7},
 number = {8},
 orcid-numbers = {Bhowmick, Somnath/0000-0003-4094-5204
Medhi, Amal/0000-0001-5322-1649},
 times-cited = {10},
 title = {Sensory-organ-like response determines the magnetism of zigzag-edged
honeycomb nanoribbons},
 unique-id = {ISI:000314762200009},
 volume = {87},
 year = {2013}
}