Abstract
We investigate quantum phase transitions in XY spin models using Dzyaloshinsky-Moriya (DM) interactions. We identify the quantum critical points via quantum Fisher information and quantum coherence, finding that higher DM couplings suppress quantum phase transitions. However, quantum coherence (characterized by the l1-norm and relative entropy) decreases as the DM coupling increases. Herein, we present both analytical and numerical results.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 11675113, and 11765016), the Natural Science Foundation of Beijing (Grant No. KZ201810028042), and Jiangxi Education Department Fund (Grant Nos. GJJ161056, and KJLD14088). Open access funding provided by Max Planck Society.
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Ye, BL., Li, B., Wang, ZX. et al. Quantum Fisher information and coherence in one-dimensional XY spin models with Dzyaloshinsky-Moriya interactions. Sci. China Phys. Mech. Astron. 61, 110312 (2018). https://doi.org/10.1007/s11433-018-9262-9
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DOI: https://doi.org/10.1007/s11433-018-9262-9