Numerical Study of Excited States in the Shastry-Sutherland Model(Condensed Matter : Electric Structure, Electical, Magnetic and Optical Properties)
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概要
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We investigate excited states of the Shastry-Sutherland model using a kind of variational method. Starting from various trial states which include one or two triplet dimers, we numerically pursue the best evaluation of the energy for each set of quantum numbers. We present the energy difference as a function of either the coupling ratio or the momentum and compare them with the perturbative calculations. Our data suggest that the helical order phase exists between the singlet dimer phase and the magnetically ordered phase. In comparison with the experimental data we can estimate the intra-dimer coupling J and the inter-dimer coupling J' for SrCu_2(BO_3)_2: J'/J 0.65 and J = 87K.
- 社団法人日本物理学会の論文
- 2003-01-15
著者
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Munehisa Tomo
Faculty Of Engineering University Of Yamanashi
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MUNEHISA Yasuko
Faculty of Engineering, Yamanashi University
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Munehisa Yasuko
Faculty Of Engineering University Of Yamanashi
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