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Self-Localization of Composite Spin-Lattice Polarons

机译:自旋格子极化子的自定域

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摘要

Self-localization of holes in the Holstein t-J model is studied in the adiabatic limit using exact diagonalization and the retraceable path approximation. It is shown that the critical electron-phonon coupling λ_c decreases with increasing J and that this behavior is determined mainly by the incoherent rather than by the coherent motion of the hole. The obtained spin correlation functions in the localized region can be understood within a percolation picture where antiferromagnetic order can persist up to a substantial hole doping. These results restrict the possibility of self-localization of holes in lightly doped cuprates.
机译:使用精确的对角线化和可追溯路径近似,在绝热极限条件下研究了Holstein t-J模型中孔的自定位。结果表明,临界电子-声子耦合λ_c随着J的增加而减小,并且这种行为主要由空穴的非相干而不是空穴的相干运动决定。可以在渗流图中理解所获得的局部区域中的自旋相关函数,在该渗流图中,反铁磁顺序可以持续到大量的空穴掺杂。这些结果限制了在轻度掺杂的铜酸盐中空穴自定位的可能性。

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