分类： 物理学 >> 基本粒子与场物理学 提交时间： 2016-05-08
摘要： A holographic description on the antiferromagnetic quantum phase transition (QPT) induced by the magnetic field and the criticality in the vicinity of the quantum critical point have been investigated numerically recently. In this paper, we show that the properties of QPT in this holographic model are governed by a CFT dual to the emergent AdS(2) in the IR region, which confirms that the dual boundary theory is a strong coupling theory with dynamic exponent z = 2 and logarithmic corrections appearing. We also compare them with the results from the Hertz model by solving the RG equation at its upper critical dimension and with some experimental data from pyrochlores Er2-2xY2xTi2O7 and BiCoPO5.
分类： 物理学 >> 基本粒子与场物理学 提交时间： 2016-05-08
摘要： We propose a gravity dual of antiferromagnetic quantum phase transition induced by magnetic field and study the critical behavior around the quantum critical point. It turns out that the boundary critical theory is a strong coupling theory with dynamic exponent z = 2 and that the hyperscaling law is violated and logarithmic corrections appear near the quantum critical point. Some novel scaling relations are predicated, which can be tested by experiment data in the future. We also make some comparison with experimental data on low-dimensional magnets BiCoPO5 and pyrochlores Er2-2xY2xTi2O7.
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