| Issue |
EPL
Volume 97, Number 3, February 2012
|
|
|---|---|---|
| Article Number | 37001 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/97/37001 | |
| Published online | 01 February 2012 | |
Spontaneous quantum Hall effect in quarter-doped Hubbard model on honeycomb lattice and its possible realization in doped graphene system
Department of Physics, Renmin University of China - Beijing 100872, PRC
Received:
3
August
2011
Accepted:
19
December
2011
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 
. 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.
PACS: 75.10.-b – General theory and models of magnetic ordering / 73.43.-f – Quantum Hall effects / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EPLA, 2012
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