Controllability of ferromagnetism in graphene

Tianxing Ma; Feiming Hu; Zhongbing Huang; Hai-Qing Lin
September 2010
Applied Physics Letters;9/13/2010, Vol. 97 Issue 11, p112504
Academic Journal
We systematically study magnetic correlations in graphene within Hubbard model on a honeycomb lattice by using quantum Monte Carlo simulations. In the filling region below the Van Hove singularity, the system shows a short-range ferromagnetic correlation, which is slightly strengthened by the on-site Coulomb interaction and markedly by the next-nearest-neighbor hopping integral. The ferromagnetic properties depend on the electron filling strongly, which may be manipulated by the electric gate. Due to its resultant controllability of ferromagnetism, graphene-based samples may facilitate the development of many applications.


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