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首页> 外文期刊>Physical review >Spectroscopic signatures of next-nearest-neighbor hopping in the charge and spin dynamics of doped one-dimensional antiferromagnets
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Spectroscopic signatures of next-nearest-neighbor hopping in the charge and spin dynamics of doped one-dimensional antiferromagnets

机译:掺杂一维反铁磁体的电荷和自旋动态的下一个最近邻近跳跃的光谱特征

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摘要

We study the impact of next-nearest-neighbor (NNN) hopping on the low-energy collective excitations of strongly correlated doped antiferromagnetic cuprate spin chains. Specifically, we use exact diagonalization and the density matrix renormalization group method to study the single-particle spectral function, the dynamical spin and charge structure factors, and the Cu L-edge resonant inelastic x-ray scattering (R1XS) intensity of the doped t-t'-J model for a set of t' values. We find evidence that the spin and charge degrees of freedom of the doped holes are not strictly separated anymore as |t'| increases and identify the consequences of this in the dynamical response functions. The inclusion of NNN hopping couples the spinon and holon excitations, resulting in the formation of a spin polaron, where a ferromagnetic spin-polarization cloud dresses the doped carrier. The spin polaron manifests itself as additional spectral weight in the dynamical correlation functions, which appear simultaneously in the spin- and charge-sensitive channels. We also demonstrate that RIXS can provide a unique view of the spin polaron, due to its sensitivity to both the spin and charge degrees of freedom.
机译:我们研究了下一个最近邻(NNN)跳跃对强掺杂掺杂防冻铜旋转链的低能量集体激发的影响。具体地,我们使用精确的对角化和密度矩阵重整化组方法来研究单粒子谱功能,动态自旋和电荷结构因子,以及掺杂T的Cu L边缘谐振非弹性X射线散射(R1X)强度-t'-j模型为一组t'值。我们发现证据表明,掺杂孔的自由度的自由度不再严格分开| T'|在动态响应函数中增加并确定这一点的后果。包含NNN跳跃耦合旋转旋转和清醒激发,导致旋转极化子的形成,其中铁磁性旋转偏振云穿过掺杂载体。旋转极化子在动态相关函数中表现为额外的光谱重量,其在自旋和电荷敏感通道中同时出现。我们还证明,由于其对旋转和电荷自由度的敏感性,rixs可以提供旋转极化子的独特视图。

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  • 来源
    《Physical review》 |2020年第7期|075134.1-075134.12|共12页
  • 作者单位

    Department of Physics and Astronomy The University of Tennessee Knoxville Tennessee 37966 USA Joint Institute of Advanced Materials at The University of Tennessee Knoxville Tennessee 37996 USA Theoretical Division T-4 Los Alamos National Laboratory Los Alamos New Mexico 87545 USA;

    Stewart Blusson Quantum Matter Institute University of British Columbia Vancouver British Columbia Canada V6T 1Z4 Department of Physics and Astronomy University of British Columbia Vancouver British Columbia Canada V6T 1Z1;

    Department of Mathematics Augusta University 1120 15th Street Augusta Georgia 30912 USA Department of Chemistry and Physics Augusta University 1120 15th Street Augusta Georgia 30912 USA;

    Department of Chemistry and Physics Augusta University 1120 15th Street Augusta Georgia 30912 USA;

    Department of Physics and Astronomy The University of Tennessee Knoxville Tennessee 37966 USA Joint Institute of Advanced Materials at The University of Tennessee Knoxville Tennessee 37996 USA;

    Department of Chemistry and Physics Augusta University 1120 15th Street Augusta Georgia 30912 USA;

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