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Stability of quantum critical points in the presence of competing orders

机译:存在竞争订单时量子临界点的稳定性

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We investigate the stability of quantum critical points (QCPs) in the presence of two competing phases. These phases near QCPs are assumed to be either classical or quantum and assumed to repulsively interact via square-square interactions. We find that for any dynamical exponents and for any dimensionality strong enough interaction renders QCPs unstable and drives transitions to become first order. We propose that this instability and the onset of first-order transitions lead to spatially inhomogeneous states in practical materials near putative QCPs. Our analysis also leads us to suggest that there is a breakdown of conformal field theory scaling in the Anti de Sitter models, and in fact these models contain first-order transitions in the strong-coupling limit.
机译:我们研究了存在两个竞争阶段的量子临界点(QCP)的稳定性。假设接近QCP的这些相是经典相或量子相,并假设它们通过平方-方形相互作用进行排斥相互作用。我们发现,对于任何动力学指数和任何维数,足够强的交互作用都会使QCP变得不稳定,并使过渡转变为一阶。我们提出,这种不稳定性和一阶跃迁的开始会导致实际材料在推定QCP附近的空间不均匀状态。我们的分析还提示我们,Anti de Sitter模型中存在共形场理论定标的分解,实际上,这些模型在强耦合极限中包含一阶跃迁。

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  • 来源
    《Physical review》 |2010年第16期|p.165128.1-165128.20|共20页
  • 作者单位

    Theory Division, Los Alamos National Laboratory, MS B 262, Los Alamos, New Mexico 87545, USA,Instituut-Lorentz for Theoretical Physics, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands;

    Instituut-Lorentz for Theoretical Physics, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands;

    Theory Division, Los Alamos National Laboratory, MS B 262, Los Alamos, New Mexico 87545, USA;

    Theory Division, Los Alamos National Laboratory, MS B 262, Los Alamos, New Mexico 87545, USA;

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