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Competing orders in the generalized Hund chain model at half filling

机译:半填充时广义Hund链模型中的竞争订单

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摘要

By using a combination of several nonperturbative techniques—a one-dimensional field theoretical approach together with numerical simulations using density-matrix renormalization group—we present an extensive study of the phase diagram of the generalized Hund model at half filling. This model encloses the physics of various strongly correlated one-dimensional systems, such as two-leg electronic ladders, ultracold degenerate fermionic gases carrying a large hyperfine spin 3/2, other cold gases such as ytterbium 171 or alkaline-earth condensates. A particular emphasis is laid on the possibility to enumerate and exhaust the eight possible Mott-insulating phases by means of a duality approach. We exhibit a one-to-one correspondence between these phases and those of the two-leg electronic ladders with interchain hopping. Our results obtained from a weak-coupling analysis are in remarkable quantitative agreement with our numerical results carried out at moderate coupling.
机译:通过结合使用几种非摄动技术(一维场理论方法以及使用密度矩阵重新归一化组的数值模拟),我们对半填充时广义Hund模型的相图进行了广泛的研究。该模型包含了各种高度相关的一维系统的物理原理,例如两腿电子梯子,携带大型超细自旋3/2的超冷简并铁氧体气体,other 171或碱土冷凝物等其他冷气体。特别强调了通过对偶方法枚举和耗尽八个可能的Mott绝缘相的可能性。我们展示了这些阶段与带有链间跳变的两腿电子梯形阶段之间的一一对应关系。我们从弱耦合分析获得的结果与在中等耦合条件下进行的数值结果在数量上有着显着的一致性。

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  • 来源
    《Physical review》 |2010年第15期|p.155134.1-155134.24|共24页
  • 作者单位

    Laboratoire de Physique Theorique et Modelisationdensity wave, CNRS UMR 8089, Universite de Cergy-Pontoise, Site de Saint-Martin,F-95300 Cergy-Pontoise Cedex, France;

    Laboratoire Materiaux et Phenomenes Quantiques, Universite Paris Diderot, 2 Place Jussieu, 75205 Paris Cedex 13, France;

    Laboratoire de Physique Theorique, IRSAMC, Universite de Toulouse-UPS, F-31062 Toulouse, France,LPT, IRSAMC, CNRS, F-31062 Toulouse, France;

    Laboratoire de Physique Theorique et Modelisationdensity wave, CNRS UMR 8089, Universite de Cergy-Pontoise, Site de Saint-Martin,F-95300 Cergy-Pontoise Cedex, France;

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  • 正文语种 eng
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  • 关键词

    fermions in reduced dimensions (anyons,composite fermions,luttinger liquid,etc.); lattice fermion models (hubbard model,etc.);

    机译:缩小尺寸的费米子(任意子;复合费米子;助剂液体等);晶格费米子模型(哈伯德模型等);

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