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Bose and Mott glass phases in dimerized quantum antiferromagnets

机译：二聚化量子反铁磁体中的玻色和莫特玻璃相

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摘要

We examine the effects of disorder on dimerized quantum antiferromagnets in a magnetic field, using the mapping to a lattice gas of hard-core bosons with finite-range interactions. Combining a strong-coupling expansion, the replica method, and a one-loop renormalization-group analysis, we investigate the nature of the glass phases formed. We find that away from the tips of the Mott lobes, the transition is from a Mott insulator to a compressible Bose glass, however the compressibility at the tips is strongly suppressed. We identify this finding with the presence of a rare Mott glass phase and demonstrate that the inclusion of replica symmetry breaking is vital to correctly describe the glassy phases. This result suggests that the formation of Bose and Mott glass phases is not simply a weak localization phenomenon but is indicative of much richer physics. We discuss our results in the context of both ultracold atomic gases and spin-dimer materials.
机译：我们通过映射到具有有限范围相互作用的硬核玻色子的晶格气，研究了磁场对磁场中二聚量子反铁磁体的无序影响。结合强耦合展开，复制方法和单回路重归一化组分析，我们研究了形成的玻璃相的性质。我们发现，远离Mott裂片的尖端，是从Mott绝缘体到可压缩的玻色玻璃的过渡，但是强烈抑制了尖端的可压缩性。我们确定存在罕见的莫特玻璃相的发现，并证明复制对称性破裂的包含对于正确描述玻璃相至关重要。该结果表明，玻色和莫特玻璃相的形成不仅是弱的局部化现象，而且还指示了更丰富的物理学。我们在超冷原子气体和自旋二聚体材料的背景下讨论我们的结果。

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  • 来源
    《Physical review》 |2015年第18期|180201.1-180201.5|共5页
  • 作者

    S. J. Thomson; F. Krueger;

  • 作者单位

    SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, United Kingdom,ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom,London Centre for Nanotechnology, University College London, Gordon Street, London WC1H 0AH, United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    quantized spin models; boson systems;

    机译：量化自旋模型玻色子系统;

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