Slave-particle studies of the electron-momentum distribution in the low-dimensional t-J model.
Slave-particle studies of the electron-momentum distribution in the low-dimensional t-J model.
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DOI：
10.1103/physrevb.47.15192
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发表时间：
1993-04
期刊：
影响因子：
--
通讯作者：
Feng;Wu;Su;Yu.
中科院分区：
文献类型：
--
作者：
Feng;Wu;Su;Yu.
在从粒子方法的框架下研究了 t-J 模型中的电子动量分布函数。在规范场和相关理论中使用的解耦方案中，我们正式处理相位和幅度波动以及约束，而无需进一步近似。我们的结果表明，在高分辨率角分辨光电子发射和反光电子发射实验中观察到的电子费米面无法在这个框架内解释，并且不遵守物理电子的总和规则。通过考虑非局部弦场 [Z.1]，一维中 k 近似 k(F) 和 k 近似 3k(F) 附近的电子动量分布函数的正确缩放行为可以重现。 Y.翁等人，物理学。 Rev. B 45, 7850 (1992)]，但总体动量分布仍然不正确，至少在平均场水平上是这样。
The electron-momentum distribution function in the t-J model is studied in the framework of the slave-particle approach. Within the decoupling scheme used in gauge-field and related theories, we treat formally phase and amplitude fluctuations as well as constraints without further approximations. Our result indicates that the electron Fermi surface observed in high-resolution angle-resolved photoemission and inverse-photoemission experiments cannot be explained within this framework, and the sum rule for the physical electron is not obeyed. A correct scaling behavior of the electron-momentum distribution function near k approximately k(F) and k approximately 3k(F) in one dimension can be reproduced by considering the nonlocal string fields [Z. Y. Weng et al., Phys. Rev. B 45, 7850 (1992)], but the overall momentum distribution is still not correct, at least at the mean-field level.