Strain induced edge magnetism at zigzag edge in graphene quantum dot

Abstract

We study the temperature dependent magnetic susceptibility of a strained graphene quantum dot by using the determinant quantum Monte Carlo method. Within the Hubbard model on a honeycomb lattice, our unbiased numerical results show that a relative small interaction $U$ may lead to a edge ferromagnetic like behavior in the strained graphene quantum dot, and a possible room temperature transition is suggested. Around half filling, the ferromagnetic fluctuations at the zigzag edge is strengthened both markedly by the on-site Coulomb interaction and the strain, especially in low temperature region. The resultant strongly enhanced ferromagnetic like behavior may be important for the development of many applications.

arXiv comment4 Pages, and 6 figures. More discussions are added and accepted for publication as a Regular Article in Physical Review B

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• Hubbard and Heisenberg models on hyperbolic lattices: Metal-insulator transitions, global antiferromagnetism, and enhanced boundary fluctuations
• Triplet $p$-wave pairing correlation in low doped zigzag graphene nanoribbons
• Mean field theory of short range order in strongly correlated low dimensional electronic systems
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• Anisotropy engineering edge magnetism in zigzag honeycomb nanoribbons
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