Character of frustration on magnetic correlation in doped Hubbard model

Peng Wang, Xinran Ma, Jingyao Wang, Yamei Zeng, Ying Liang () and Tianxing Ma
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Peng Wang: Beijing Normal University
Xinran Ma: Beijing Normal University
Jingyao Wang: Beijing Normal University
Yamei Zeng: Beijing Normal University
Ying Liang: Beijing Normal University
Tianxing Ma: Beijing Normal University

The European Physical Journal B: Condensed Matter and Complex Systems, 2016, vol. 89, issue 2, 1-6

Abstract: Abstract The magnetic correlation in the Hubbard model on a two-dimensional anisotropic triangular lattice is studied by using the determinant quantum Monte Carlo method. Around half filling, it is found that the increasing frustration t ′ / t could change the wave vector of maximum spin correlation along (π,π) → (π, 5π/6) → (5π/6, 5π/6) → (2π/3, 2π/3), indicating the frustration’s remarkable effect on the magnetism. In the studied filling region ⟨n⟩ = 1.0 − 1.3, the doping behaves like some kinds of frustration, which destroys the (π,π) AFM correlation quickly and push the magnetic order to a wide range of the (2π/3, 2π/3)120° order when the t ′ / t is large enough. Our non-perturbative calculations reveal a rich magnetic phase diagram over both the frustration and electron doping.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1140/epjb/e2016-60785-3

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