Quantum criticality of a spin-1 XY model with easy-plane single-ion anisotropy via a two-time Green function approach avoiding the Anderson-Callen decoupling
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- 作者：M.T. Mercaldoa ; mtm@physics.unisa.it" class="auth_mail" title="E-mail the corresponding author ; I. Rabuffoa ; L. De Cesarea ; A. Caramico D'Auriab
- 关键词：Quantum phase transitions ; XY model ; Single-ion anisotropy
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2016
- 出版时间：1 April 2016
- 年：2016
- 卷：403
- 期：Complete
- 页码：68-76
- 全文大小：532 K
文摘
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Quantum criticality induced by single-ion anisotropy in a spin-1 XY model is studied.
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Two-time Green function method is employed, avoiding the Anderson-Callen decoupling.
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Critical line ending in the QCP and the related TIM-like shift exponent are determined
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Crossover lines between different asymptotic regimes around the QCP are estimated.