Phase diagram of the Kitaev-Heisenberg model using various finite-size clusters

Masaaki Nakamura; Masahiro Kadosawa; Satoshi Nishimoto; Yukinori Ohta

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Phase diagram of the Kitaev-Heisenberg model using various finite-size clusters

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arxiv 2304.08422 v1 pith:F5DSJPAE submitted 2023-04-17 cond-mat.str-el

Masahiro Kadosawa , Masaaki Nakamura , Yukinori Ohta , Satoshi Nishimoto This is my paper

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keywords clustersboundariesestimatedfourkitaev-heisenbergmodelphaseaccurately

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abstract

We estimate phase boundaries of four ordered and two spin-liquid phases for the spin-$\frac{1}{2}$ Kitaev-Heisenberg (KH) model using four kinds of relatively-small clusters, based on the second derivative of ground-state energy. The estimated values are compared between the clusters as well as the previous iPEPS results. We thus find that the boundaries can be accurately estimated within limited-size clusters. The used clusters may appropriate to study higher-$S$ KH models having less fluctuations.

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