Journal
EPL
Volume 97, Issue 3, Pages -Publisher
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
DOI: 10.1209/0295-5075/97/37001
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Funding
- NSFC [11034012]
- National Basic Research Program of China [2007CB925001, 2010CB923004]
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We show that a magnetic insulating state with nonzero spin chirality is realized in a quarter-doped Hubbard model on honeycomb lattice as a result of the nesting property of the Fermi surface. This state is topological nontrivial and has a quantized Hall conductance of sigma(xy) = e(2)/h. We find that such a state is robust against next-nearest-neighboring hopping and we propose that it can be realized in a quarter-doped graphene system. We also show that the quarter-doped Hubbard model on honeycomb lattice is equivalent to a 3/4-filled Hubbard model on triangular lattice in the weak coupling limit, in which a similar effect was predicted previously. Copyright (C) EPLA, 2012
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