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• W3101091567 endingPage "083031" @default.
• W3101091567 startingPage "083031" @default.
• W3101091567 abstract "In a previous paper (Liu et al 2012 Phys. Rev. B 85 195144), a variational Monte Carlo method (based on Gutzwiller projected states) was generalized to S = 1 systems. This method provided very good trial ground states for the gapped phases of an S = 1 bilinear-biquadratic (BLBQ) Heisenberg chain. In this paper, we extend the approach to study the low-lying elementary excitations in S = 1 chains. We calculate the one-magnon and two-magnon excitation spectra of the BLBQ Heisenberg chain and the results agree very well with recent data in the literature. In our approach, the difference of the excitation spectrum between the Haldane phase and the dimer phase (such as the even/odd size effect) can be understood from their different topologies of the corresponding mean field theory. We especially study the Takhtajan–Babujian critical point. Despite the fact that the 'elementary excitations' are spin-1 magnons, which are different from the spin-1/2 spinons in Bethe solution, we show that the excitation spectrum, critical exponent () and central charge (c = 1.45) calculated from our theory agree well with the Bethe ansatz solution and conformal field theory predictions." @default.
• W3101091567 created "2020-11-23" @default.
• W3101091567 creator A5029539169 @default.
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• W3101091567 date "2014-08-14" @default.
• W3101091567 modified "2023-10-17" @default.
• W3101091567 title "Gutzwiller approach for elementary excitations inS= 1 antiferromagnetic chains" @default.
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• W3101091567 doi "https://doi.org/10.1088/1367-2630/16/8/083031" @default.
• W3101091567 hasPublicationYear "2014" @default.
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